'cause then you wouldn't have to carry the PC around with you, Cthulu.
Seriously though, while there are probably only a few folks who are interested in doing this, it's good that there's a way for those who are interested to pull it off.
The idea doesn't appeal to me, personally, as I'm happy with my Palm for such things, but that doesn't mean others shouldn't do it if they want to. More power to 'em.
Besides, if that capability sells a few more units, then the market is that much bigger, and we get that much closer to standards, and more content availability, and better prices, and ....