[JayReding]

At the point you create a "luggable" laptop, you lose the whole portability factor that Apple is famous for, and you basically end up with a slightly smaller version of the iMac. No doubt Apple could technically do it, but I think the replies here make it clear why they won't. The market for "luggable" laptops is not all that large, and a professional user isn't going to use a laptop for design work regardless. It's just not a market that's worth the costs of entering into.