Web 2.0 is here, it just got here come months ago and people is already thinking about web 3.0, apaprently people in China started already :P

Well, lets take the next step and start questioning about Web 4.0, or why not... Web 5.0, 6.0?

What will javascript do then? Will another scripting language (Python¿?) take its place?. Will people start using XUL for web apps?, will XAML take over Xul's place? will there still be non-standar browsers?

There are still a lot to questions open for web x.0, so choose your value for x and start wandering ;)