You reach a certain pinnacle of design where if you change something there is more negatives that positives. It is like how people keep coming up with designs for better toilets. People keep trying but you know what? That design done back in the 1596 turns out to best and that is why all the other "improved" toilet designs don't exist anymore and that is why your toilet in your house is the same design from the 1596.
Analog thumbsticks have been around for ~20 years, it might be a little soon to assume that they'll never be bested, especially considering what's happened with touch and gyro on mobile. There a fair number of kids out there who've never used a physical controller for any significant amount of time and might never start.