My wariness of touchscreens with an SLR will die over time. I liken SLRs going to touchscreens to video game The issue is not how touchscreen technology evolves, but how our senses evolve. Touch screens are designed to be used using eyes, and lack all the different kind of other feedbacks we get from other senses using for example mechanical dials (tactile and audible ones). Sure, some devices try to employ vibrations to imitate that kind of feedbacks, but they don't work as well - because they lack the proper "positioning". Can you type on a virtual keyboard as you can do on a physical one? Can you know how many stops you changed aperture without looking at the numbers with a dial, and with a touch screen?
Touch screens are very versatile because they can display different interfaces and adapt to different tasks, that's why they can be very good on smartphones. But with a dedicated device like a camera, a touchscreen looks more a way to save on a camera design and building, and not to improve ergonomics.
+1 I loathe touch screens on camera's. Adjustments should be easy to make on touch alone while the eye is on the subject.
5D3, 5D2, Sony α6000, G16 | SY14 f/2.8, Ʃ20 f/1.8, 24 f/2.8, 35 f/2, Ʃ35 f/1.4A, 50 f/1.8 I, Ʃ50 f/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 70-300L, 100-400L | E-mount: SY12 f/2, Ʃ19 & 30 f/2.8 EX DN, 16-70 ZA OSS, 55-210 OSS, Metabones SB | FT-QL, AE-1P | FD(n) & FL lenses