If Activision were to add Drum and Microphone support to Guitar Hero 2, 3 and Aerosmith through DLC, would you buy it? I dunno if I would, since I mainly focus on playing guitar, but I might do.

And do you think they might do this? And how do you think they might price it?

IF they did for Guitar Hero 3...of course.   But they never will.

I think they should make all the songs from those games as DLC for World Tour. All originals, make it the same price as the other DL songs, they'd make a fortune, and we'd finally be able to play some friggin Cream on drums.

TTFAF on drums.  Hellz ya.

No way, I only play guitar in the rock band and GH games. I'm too embarrassed to sing and I suck at drums because I can't coordinate my hands and my feet at the same time lol.

I doubt that they'll ever patch that in.