why the N800 won't kill the N95:
1/ it's too big - the ngage didn't kill their other smartphones either
2/ it doesn't have A2DP
3/ Nokia's internal politics won't let them

however, an N800 with a 3G+GSM module WOULD kill the E90 which I hear is crippled by S60, because although S60 is more developed than the 9xxx predecessor's OSs, it's not suited to a clamsheel with keyboard!

I am hoping that the new Wimax variant of the N800 will give Nokia the chance to fix the video bandwidth hardware design flaw.