Do the math guys. A Yamaha's buttons (considering Yamaha's build quality) would die long before the touch screen.

Yes.., touch screens have their (number of presses), but I can't tell you how many people I know with original Korg Trinity's using the "original touch screen" to date with no problems and have been giggin with them since day one. Same goes for the original Triton!

If I had a Yamaha arranger with a touch screen (based on Yamaha's build history).., I'd be 10 times more worried about the buttons going before the touch screen.