As someone that makes my own keyboard firmware, 100% agree. For most people, typing speed isn't a bottleneck. There is a whole community of people that type faster than 250wpm on custom, chording-enabled keyboards. The tradeoff is that it takes years to relearn how to type. Its the same as being a stenographer at that point. Its not worth it for most people.

Even if there was a new layout that did suddenly allow everyone to type twice as fast, what would we get with that? Maybe twice as many social media posts, but nothing actually useful.

I'd imagine at this point that most social media posts are done by swiping or tapping a phone's virtual keyboard (if one is used at all).