And yet, if I were to meet someone who was a few months into a new js web app, I could probably guess which framework they were using with 5 guesses or less 95% of the time. Also, I would bet that all 5 of the top frameworks will be reasonably supported for the next 5 years. As for the many frameworks that make up the last 5% of usage and have shakier futures, I doubt many new devs are actually using them.

It is always a red flag for me when someone starts arguing for less choice, more monolithic frameworks, and the inevitable lock in that comes along with having only one or two options.