The original team is still (75%) with Nvidia. AFAIK very few of them have left since the GeForce 256 chip was first produced. The 3DFx h/w guys where hired with the demise of 3DFx. Don't know about the s/w guys from 3DFx though...
Unfortunately the s/w guys are under staffed compared to the h/w, and they have to produce a universal windows driver that will work with ALL Nvidia cards from the first TNT's to the latest GF4's; where as 3DFx produced specific DOS level drivers.