Except at launch Diablo 3 has been made to run ok on older machines so I can still play it :D
It will no doubt be just as short lived though, for me anyway. None of what made D2 an enjoyable experience to play over and over again made it to Diablo 3. I'm going to give all the characters a go and just leave it at that. I get a similar feel from Diablo 3 as I did with Starcraft 2. No real interest to keep playing. I guess Blizzard's vision for games has changed and I just no longer find their stuff interesting. Shame, because I really liked their earlier work. At least there's no online DRM on those so I can play those forever!