As Wikipedia is part of the Web 2.0 revolution, there has been already pressure to upgrade to Web 3.0. I personally believe we should take more drastic approach, and go directly for Web 4.0.
This Albert Einstein quote now rings in my head:
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
domas mituzas 
HTML 3.2! URLs with tildes! OPTIMISED FOR LYNX!
Say – I’ve heard of TCP/IP via carrier pigeon, but with sticks and stones? ;-) How well will they scale?