You have best friends now, how did you meet them? In the worst case scenario where people you currently know don't make it, do you doubt that you'll be able to quickly make new friends?
Suppose that there are hundreds of people who would want to be your best friend, and that you would genuinely be good friends with. Your problem is that you don't know who they are, or how to find them. Not to be too much of a technology optimist :-), but imagine if the super-Facebook-search engine of the future would be able to accurately put you in touch with those hundreds.
I met a significant percentage of my friends on a message board associated with a webcomic called The Order of the Stick. Others I met in school. One I met when she sent me a fan e-mail regarding my first webcomic. A majority of my friends, I met through people I already knew through one method or another.
When I pop out into the bright and glorious future, might they have a super-Facebook that would ferry me the cream of the friendship crop and have me re-ensconced in a comfy social net in a week tops? Maybe. But that's adding one more if to the long ...
And happy new year to everyone.