"While much of this will likely remain as part of purely individualized fantasy worlds never meant to be shared, it is foolish to claim that nothing will be shared and that everyone will retreat into their own fantasy worlds."

A post full-dive society would likely look a lot like the internet. Yes, people would have the option to retreat into their own fully personalized, virtual space like somebody can choose to play a single player video game. Many other people would opt to exist with others in like-minded communities. For every demographic, interest, opinion and sub-culture, a virtual world.