Given the nature of the game, and the financial realities of 21st-century game development, you should all be expecting Diablo III to appear on a console at some stage. So try not to let the following statement from Blizzard's Jay Wilson freak you out too much. Because it's for the best!
"One of the reasons why we're exploring the idea of a console version of Diablo III because we feel that the controls and the style of the game lend itself to a console", Wilson told PC Gamer. "With some of our early experiments in putting a direct control scheme into the game via a 360-like analogue controller, I've been ‘Oh this feels even better, with direct control…'"
Sounds good to me! Not everyone has a PC that can play the game (or a Mac!), so when this inevitable console version comes, and if it plays that well, then all the better. The more people playing the merrier!