Oh I don't know about MMORPG's being in an infant state. Everquest has what, 60,000 paying members? They're even more popular in some countries.
I have an excellent gaming PC, but for a quick and fast game, nothing beats a console. There's a feeling from sitting down and blowing through a city in Crazy Taxi that the PC can't reproduce. Fighthing games are much better on a console as well.
Each unit definatly has its own place.
The only thing that'd keep me from buying an XBox right now would be if Halo was released for the PC at the same time