I really hope this doesn't come about. I love to shop online, usually just browsing. I shop online so I'm not being pestered by shop assistants and other shoppers.
Maybe better ability for a shopper to get help, but otherwise, why do you really want to see where other shoppers currently are?
For those that don't want to interact with others you will have the option of making your avatar repel others. It could mutter and cast hard eyes, grope other shoppers, have a bad case of leprosy, be hugely fat and naked, etc. Or you can go the other way and be suspiciously friendly, incredibly perky, more than helpful, etc.
There are infinite other ways to isolate yourself, as some know all too well, and Apple will give you the tools to be creatively alone, to think different (that worked for a while, these things can be time-sensitive).
And, as a bonus, you could get attracting programs so that others will talk to you and treat you like an, well, attractive person. Hot, scantily clad women, or whatever, will come on to you, hoping for a hook-up. Other shoppers will want to hear your opinions on politics, religion and other deep thoughts. People will invite you to gala dinners and events.
This will even work for gamers who haven't seen the sun or washed for months. Those scantily clad hot women will hang on your every rant about Apple's weak video card.
Actually, that whole store thing is awesome. 3D would be really interesting, like those walk-through home remodel programs. They don't necessarily take too much computer to run, do they?
Anyway, having to buy a new computer in order to have an interesting shopping experience at the Apple Store...does it get any better than that?
Compare this to shopping on Amazon, where it is actually difficult to find things with their strange search engine. Hmmm, search, then maps?, street-level views, this leads to an alliance with Google, eh?