You guys probably have about 2 years to get a computer that can play the game

PS1 Diablo 2 Items was lame. They basically got rid of the mouse altogether. You had to walk up and fight things instead of click on them, so you were constantly moving to stay in position to deal damage (whereas clicking would've done that automatically). And then to bandage the obvious difficulty of inventory/skill management in combat, they used weird button combinations for quickspells and items. Diablo 2 Items is quite a bit faster paced, as I'm sure Diablo 3 will be.

You guys probably have about 2 years to get a computer that can play the game. And from the looks of it, a computer from last year or earlier can play it, so there should be no problem meeting the hardware requirements in the future. It's Blizzard, afterall