Given some of the more recent releases coming down the pipe for the 360 (Shadowrun, Halo 2) and many more titles slated for simultaneous PC and 360 release, it begs the somewhat obvious question, is Microsoft attempting to converge PC gaming with the Xbox so the two become so synonymous with each other that eventually they may try to supplant the PC gaming industry entirely
Granted this is largely due to 1st and 2nd party titles but it makes a lot of sense in a way, given the PC gaming industry's propensity for constant piracy and chaotic system requirements and constantly half finished games being released as new (Battlefield series, NWN2 et al)
Some of the downsides of course are obvious, the higher than acceptable failure rate of the 360, who wants Microsoft to completely control that niche of the market, and the fact that some games exist solely due to the fact that to publish a sleeper hit these days only takes hard work, a website and some word of mouth, the small or amateur developer still has no place in the Xbox lineup but it could if they expand Xbox live into a youtube for games in the next iteration.
That WASD+Mouse wireless controller for the Xbox 720 would definitely let the Xbox fill this slowly marginalized and well loved gaming market. Is it possible? Do we even want Microsoft to try? Who knows, the answer probably lies in the next cycle of console wars.
I'd honestly like to see how the players win ratio turns out between 360 & PC gamers against each other.