Apostate prophet finds no spiritual need; purpose of changing qibla?

In answer to the video "The Truth About The Kaaba"

As an anticipation to the people's reaction in Medina regarding this last change of qibla the Quran answers

2:142"The East and the West belong only to Allah; He guides whom He likes to the right path".

As similarly stated in 2:115,26:28,73:9 and more particularly in 2:177, Allah is the Omnipresent grasping the universe as a whole, present in all directions one may like to face and therefore Jerusalem, the Kaaba and all other places belong to Allah, Who intrinsically has no house and no place. The prophet Solomon in the Bible similarly conveyed that transcendental notion. After he had erected the Jerusalem Temple where God was to settle and "dwell in forever", the direction where all obedient servants were to face in prayer if they wanted to be hearkened by God in Heaven,

1kings8:27"But will God indeed dwell on the earth? Behold the heaven and the heaven of heavens cannot contain You; much less this temple that I have erected".

This reality is also echoed in the book of Isaiah

Isa66:1"So says the Lord, "The heavens are My throne, and the earth is My footstool; which is the house that you will build for Me, and which is the place of My rest?". 

Without God's commission, no place has spiritual excellence or preference in its own essence. The direction in itself is therefore not something to be disputed and argued about. If one wishes to remain in a specific direction as if the place is intrisincly sacred then he may do so, however the core message would be missed; to obey a divine injunction above one's personal desires and preferences, and concentrate one's energy in outdoing one another in good deeds instead of disputing about what the Quran views as a moot point

2:143,148,177"and We did not make that which you would have to be the qiblah but that We might distinguish him who follows the Messenger from him who turns back upon his heels, and this was surely hard except for those whom Allah has guided aright...And every one has a direction to which he should turn, therefore hasten to (do) good works; wherever you are, Allah will bring you all together...It is not righteousness that you turn your faces towards the East and the West, but righteousness is this that one should believe in Allah and the last day and the angels and the Book and the prophets, and give away wealth out of love for Him to the near of kin and the orphans and the needy and the wayfarer and the beggars and for (the emancipation of) the captives, and keep up prayer and pay the poor-rate; and the performers of their promise when they make a promise, and the patient in distress and affliction and in time of conflicts-- these are they who are true (to themselves) and these are they who guard (against evil)".

This is the general principle behind every ritual, to do as one is told, as evidence of submission to the way of God. That is one of the reasons prayers for instance, are made at specific times, with even intervals where they cannot be offered. Islam is the purest form of servitude to God's will, leaving no place even for religious arrogance 

"The Prophet forbade praying after the Fajr prayer till the sun rises and after the 'Asr prayer till the sun sets". 

One can of course recite the Quran, reflect on spiritual matters or make dua/supplications in those restricted intervals.

The change of qibla indicated to the Israelites they had been definitely deposed from their spiritual leadership over mankind, a leadership that what was for them to honourably carry 2:63-64,3:187,28:5,32:24. This prophecied supplanting, as stated by Jesus in Matt21, meant they werent worthy of carrying the flame anymore, that the geographical center of monotheism has switched to another location, under a new established nation under God 

33:45-46"We have sent you as a witness, and as a bearer of good news and as a warner, And as one inviting to Allah by His permission, and as a light-giving torch". 

This meant that their hopes of seeing the Jerusalem Temple rebuilt for the 3rd time through Divine sanction by their messianic salvific figure was over. The era of prophethood itself has now ceased

33:40"Muhammad..is the Messenger of Allah and the khaatim of the prophets; and Allah is cognizant of all things".

This last change of qibla was also an announcement of the glad tidings of the near conquest of Mecca, a forecast of its cleaning and purification from the idols placed in it over time. It signified the near return of Islam as a fulfilment of Ibrahim's prayers and God's subsequent promise of placing in it, the righteous from among his descendants as the leaders of mankind 2:124-130. The appointment of the Kaaba as the Muslims' qibla was in honor of Ibrahim and Ismail, a confirmation of the Quran's claim about the Muslims being closer to Ibrahim than any group claiming spiritual descendancy from him 2:135. It was a favor in a series of favors bestowed upon the believers by Allah 2:150, such as the sending of a messenger from among themselves who brought them wisdom and spiritual purification

2:151"We have sent among you a Messenger from among you who recites to you Our communications and purifies you and teaches you the Book and the wisdom and teaches you that which you did not know".

At all times, the believers are told to keep their remembrance of these favors

2:152"Therefore remember Me, I will remember you, and be thankful to Me, and do not be ungrateful to Me". 

However immediately after announcing this favor, God warns the Muslims that leadership is not a bed of roses but a bed of thorns. They will be confronted with all kind of difficulties, and trials and that if they went through their ordeals with fortitude and proceeded on in the way of Allah, they would be blessed with countless blessings and rewards by Him 2:153-7 just as their failure would cause their uprooting.