Keep in mind, too, that car companies think some years ahead (or they should). If you're running R&D for a car company today, how much effort do you want to put into continuing to develop, improve, certify, integrate, etc. a technology that is largely going to be irrelevant to everything else you are doing? Manual transmissions, being pretty much solely and directly connected to ICE development, are probably _not_ part of the future, because ICE cars are, eventually, going away. Not today, not tomorrow, but the day is visible from the higher mountain tops. And the R&D types are not scrambling to process the lessons of the first couple of generations of modern electric cars, and putting more and more money into all the things that go with them. I do not know for certain, of course--they don't call me up and give me their road maps--but I'm guessing that any engineer who asks for a budget to continue to develop and improve manual transmissions for ICE cars is going to have a very hard time getting any money from corporate.
My guess, too, is that in the next ten years, you'll see the existing manual transmissions lag behind in terms of development; they won't keep pace with the rest of the car, and eventually even enthusiasts who worship at the Church of the Third Pedal will have to admit that they better find a new faith community.