If there's ANYTHING I'd want from a dedicated gaming portable, it's to not mix in so many other features as to become rediculously overpriced, or negatively impact the gaming.
Certain things can be mixed in easily (If it has powerful chips and a good screen, why balk on the media playing capabilities? If it has built-in wireless, why not toss in whatever wireless communicating you want?), but other things should either come in "expansion device" form, or not at all. If they can fit it all in without impacting the form factor, price, and quality of gaming, however...
Current phones already have a stock of games, minor or not, to choose from to amuse yourself with if you want. (Heck, I can play a pretty spiff version of Zuma on an iPod if I want.) But those are differently-focused devices that have some games for merit of having chips, screen, connectivity and storage; they're not impacting THEIR primary purpose, either. There's no reason to clutter up your handheld if the #1 purpose IS gaming...