So much of Linux is designed and modified by committee, so change is slow and painful. Apple managed to get a seriously hot UI onto FreeBSD in a (relatively) short time. Linux has everyone and their dog bartering to make changes, so the UI goes nowhere. Stop copying Windows, already. Start menu sucks. Dump X.
Did you listen to the talk? :) X.org is quite an advanced graphic system mostly doing what you want it to do. Throwing it out and trying to make something new (for what gain?) means wasting so much resources that it's not even nice. (And how is X related to some start menu?)
I don't think the parent poster is saying that X is related to GNOME and KDE's start menu clones, other than they both need changing.