It would be nice, I don't see it happening for a while though... Developers will probably look to see how well COD does since Resistance (I didn't think it was that bad) was considered a flop.
FPS games with developers insisting on using touch screen controls just end up feeling gimmicky for me though... I don't know why developers don't just use the front touch screen to mimic L2/R2 and the back to mimic L3/R3 or vice versa or let us customize that ourselves...
I imagine that would give them an easier time to bring over the controls from a console version to the Vita instead of having other studios make the vita versions with so much emphasis on touch/back touch.
Yea, I get that the vita is its own device and should not just try to copy console games/gameplay but at least for the big titles that are cross platforms there will be a big community wanting those games portable.
Personal opinion, of course, always enjoy hearing other opinions!