For myself, I really like having a keyboard that I can type fast on. Our Wolfram Cloud app runs fine on a smartphone, and lets you bring up a notebook and do programming. In a few emergency situations I’ve used this, and it’s worked better than I expected. But I can’t see myself forsaking a keyboard for serious work.

I guess the real question is: can things be reduced to point-and-click and/or menus, etc., or is more linguistic communication necessary. I strongly believe that for any form of rich expression, one needs linguistic communication. For natural language, it’s conceivable to use voice. We’ve done some experiments on voice-based Wolfram Language programming, but we haven’t figured it out. (OK, there is one case of that I’ve seen: I visited a group of 11-year-olds who’d learned Wolfram Language and were actually able to fluently speak it to each other… and were pretty disappointed that I couldn’t immediately understand what they were saying…)