He will be transitioning to Facebook to share his performance knowledge with the React Fiber team. But he is not abandoning the project , he will continue to be present in a smaller capacity.
I can't agree on your opinion that knowledge about react and redux will become meaningless in the future. The key point about redux is, you don't have to learn yet another framework specific api. It's based purely on functional programming principles, so if you wrap your head about them once, you can build apps without any magic going on under the hood.
Learning about FP was extremely valuable for my career and made me for sure a better programmer too.
Async functions have arrived with this release. In my case i could remove Babel completely. Only drawback i noticed, the compile time is a little bit longer than Babel. But the file size of my compressed and optimized bundle shrinked from 690 to 650kb. I think it's worth trying out.
Be advised, in many cases a pure component with shouldComponentUpdate() implemented, can be slower than rerendering it.
Only use it after recognizing a performance bottleneck when profiling your application.