Nothing to see there. Not long even Muslims get bored there. Wahabis are not really big on history and artifacts. If you think that this is some kind of an open air museum, think again.
Or Would you worship your Lord only if it is 'entertaining to you'?
Contemplate that.
(edits - seriously, I do. It's fascinating, the hotels, the logistics, the consumerism, the souvenier stalls, the clash of cultures, the clash of what islam means to different people around the world and the Saudi's interpretation of it. And then there's the western food chains, KFC is there, Dunkin Donuts are there, all halal of course).
Non-Catholics can enter the Vatican. Certainly you don't think the Vatican exists only to entertain, do you?
As a core part of the Sikh faith, "the Harmandir Sahib is open to all persons regardless of their religion, colour, creed, or sex." (Quoting Wikipedia.) Do you really think that makes it solely a place for sight-seeing?
Your last question is in extremely bad taste - and I say this as a non-believer.
I totally agree with GP, it should be open for all, including Non-Muslims, lapsed Muslims and everybody.
A Muslim will enter it knowing its importance, and though he may not be perfect in conduct, he would ought to ask for forgiveness.
Non-Muslims would naturally move about naturally, and end up doing things they do not know the gravity of, and over that not ask for forgiveness (from Allah). This is the reason in plain words.
For the Non-Muslims, my op stays as it is. Just because you are interested in sightseeing Mecca, doesn't mean we undo our own vows. Yes it is a beautiful place, you wanna watch it? Buy the tickets: "There is only one God, and there is no other God, that is the way straight". And you should be gladly allowed to sight see or pray.. whichever you want. Mecca's Hospitality would be yours.
Again, that's a black and white view of things, and violates the live and let live golden rule. Not just now, right after the death of the prophet Islam began to diverge. The Quran, itself was assembled into a book, after his death, during the 1st or 2nd caliphs time.
You should read up on Islamic history. The general populace has had several ebbs and highs in the nature and intensity of their belief, based on context and time.
Islamic history also has had a lot of free thinkers, even in medieval times like Al Ma'aari[1] and Ibn Rushd[2]. I also learnt, that there were liberal Muslims in 15th century Andulus-Spain, from a fascinating book by Tariq Ali[3].
I also read this recent article on 'free thinkers in Islam'[4]
Not sure if you know, the Turkish nobel prize winning author, Orhan Pamuk, also identifies himself as a cultural Muslim.
So you can't wish away the diversity and free thought. Currently we seem to be going through a phase of high tide in intensity of belief. You may be surprised to see it ebbing away in the coming decades. Just my view.
[1] https://en.wikipedia.org/wiki/Al-Ma%CA%BFarri
[2] https://en.wikipedia.org/wiki/Averroes
[3] https://en.wikipedia.org/wiki/Shadows_of_the_Pomegranate_Tre...
[4] http://www.independent.co.uk/voices/commentators/islamic-his...
Abdus Salam, devout Muslim, who quoted from the Quran in his Nobel Prize speech.
Abdus Salam, part of the Ahmadiyya Muslim Community, declared non-Muslim by the Pakistani Parliament in 1974. Despite being rejected by his own country, and living overseas, he continued to support Pakistani scientists.
Abdus Salam was buried in a cemetery in Punjab, Pakistan, next to his parents' graves. The epitaph on his tomb initially read "First Muslim Nobel Laureate" until the local magistrate forced the words "Muslim" to be removed.
"Not Islam Version A or Version B" my ass. The only way to achieve that purity is by force; use threat of expulsion or death to enforce religious totalitarianism.
Sorry to burst your bubble but non Muslims in general are only interested in visiting Mecca for the historical value and contents that it holds nothing more.
That's why I warned the OP that there is not much to see as the Saudi Wahabis destroyed virtually everything of historical value in the city and the surroundings in the same fashion ISIS has been doing in Syria or Iraq and even this is becoming a very sensitive topic for Hijazi people, the natives of the region since those Bedouins from the midlands and desert are destroying their heritage while they sitting idle and getting away with it.