Facebook goes "non-profit" -> becomes regulated in terms of privacy/earnings -> competing social network springs up -> is able to advertise and boast features t

Facebook goes "non-profit" -> becomes regulated in terms of privacy/earnings -> competing social network springs up -> is able to advertise and boast features that the "non-profit public" Facebook cannot have due to cost or regulations -> new social network is now the de-facto Facebook, and you're right where you started. and this is assuming that the whole "lets beg Mr. Zuck to pretty pretty please stop doing that whole business thing and start serving us for free, we'd appreciate it" thing works out.