So... don't touch the touchscreen? I mean, sure, it would add a bit of cost, but it wouldn't have to detract from usability or depth in any way whatsoever. People are becoming accustomed to screens being responsive to touch. (Nearly all of us have smartphones in our pockets right now.) There are times when touching an on-screen element to make something happen is simply the most efficient and intuitive thing. (You can actually quantify how efficient and intuitive it would be by counting the fingerprints on my FM3 screen.)
Just because you don't want it doesn't mean it isn't an improvement. I'm willing to bet if it were there you'd use it before too long, and you might even (very quietly) prefer it for some things.