The way I see it, speculation over whether not this is indeed the tomb of Jesus and his family will probably do nothing to change any one's views on the Bible; because after 2000 years and the countless conflicts which have been fought over it's interpretation, most people's minds are already made up.
People will always believe what they WANT to believe above anything else; especially if they've already devoted the majority of their lives towards a certain way of thinking. So much in the world has been built around Christian beliefs (both good and bad) that the fact that an important event in which that faith is based may never have actually occurred, will not deter those from continuing to make a profit... out of the prophet.
To some, religion is more than just a blueprint for living their life; it's a way of forcing obedience and asserting control over others. To those, Cameron's documentary may be viewed as threat because it challenges the very foundation of their authority; but ultimately, it is impossible for anyone to actually authenticate the remains of the "son of God", because either he ascended to heaven as described in the Bible (or Wikipedia), or he never existed in the first place... So either way, he’s not there.
This is why religion is always referred to as "faith" and not "fact".