I never really thought the DS was gimmicky at all (some of the new DSi stuff, sure, but not the concept in general). Some games make incredible use of the touch screen, while some don't really use it at all. It's really not a big deal.

As far as the 3DS goes, just from the name alone, I'm expecting 3 screens. (not really.)

As long as the games are as fun as DS games are, I'll likely end up getting it, eventually.