I cringe at the idea, but I also cringed at the idea of heath ledger playing the joker. Ashton is one of the few celebrities I can think of that seems like they would really care of nailing jobs just right.
Not to disrespect either Steven Jobs or Aston Kutcher, but while I guess Kutcher has the ego/arrogance to match the role he's playing, I cannot imagine his aura of flippancy and silliness being overcome. With all his silly, comic roles in the past, it'll be hard for anyone to take him seriously.
Wait - is this an April Fool's joke? (God, I can't wait for this day to be over!)
Many actors get typecast but who would have thought Will Smith could play Ali or Jamie Foxx play Ray Charles. Comedies/romantic comedies take a lot of dramatic range to pull off and Kutcher's performances are pretty strong in that respect. I think he's perfect for the hippie phase for sure. Steve Jobs had Hollywood good looks and for that Kutcher is a perfect match too (not to mention Kutcher gets technology more than most). I'm giving him the benefit of the doubt.
He may be a tad young for the stuff after 2000 (i.e., the part more interesting and familiar to most potential viewers) but I have a feeling that this Noah Wyle kid could make a decent show of portraying Steve Jobs.
Bale would nail the crazy part but I don't think he can handle the redeeming parts (charisma, sensitivity, etc.) based on the films I've seen. Not to say he's not a great actor, one of the best, but still.