Touchscreen in calculators

[grsbanks]

For what it's worth, the HP Prime does go some way towards this.

It still has a conventional keyboard but many operations are possible using tap, hold, drag and pinch/zoom on the touch-sensitive screen.

One of the "applications" on the Prime happens to be a spreadsheet, as it is on some other graphing calculators such as the TI Nspire CX and CX CAS so it is clearly seen by the industry as a requirement.