Now that Nvidia has finally bought 3dfx, only good can come of this. Combine 3dfx's FSAA with Nvidia's speed and T+L, and you've got one sweet graphics card! I wonder if this combo will happen after Nvidia's next card? (that ships in the spring)
Imagine what Unreal 2 would look like on a 3dfx\Nvidia board a year from now!
You're right that a combination of 3Dfx and Nvidia technologies would be a sweet deal, but I don't think that's going to happen. Nvidia will HOPEFULLY use some of the really nice FSAA capabilities from the Voodoo5 but I seriously I doubt it.
I'm confident that Nvidia will continue to deliver great 3D-hardware for the time being, but it might get even more expensive when their biggest competitor is out of the picture.
Not that the prices aren't high enough already :-(
I hope that ATI's new Radeon will give Nvidia something to think about. The prices we see now are insane and the only thing that can help that is competition.