There are thousands more things that they could put in the camera without any technical problems. Of course, I want them all. I'd like to see focus bracketing myself, its quite possible in software, and available for my 5d MK II using the Magic Lantern hacks.
Fact is, they only put in what they feel is necessary to keep competitive and little or nothing more. I don't think that will change, its not good marketing to put everything you have into a consumer grade camera, or your professional grade camera either. They add new features when they feel demand is high, or it will give them a marketing boost.