Gonna be perfectly honest, Crawford concluding that people don't want to move away from existing 5e based on the stuff they tested and didn't think people would accept is....not encouraging. Like at all. That's blatantly bad statistical inference. It would be like presuming that, because you put out a collection cup for rainwater on days where there was no expected precipitation three times, that means that it rains if and only if the forecast says it will.
Instead, the correct statistical inference here is that those specific changes were not popular. And it's really not hard to see why--a number of them futzed about with deep and fundamental mechanics like critical hits or the like, rather than addressing any of the far more relevant areas of 5e's rules that could have been updated.
The fact that 5E is the best selling version ever is all that really matters. They don't, and can't, know all the reasons behind it. Nobody can. All they can do is hope they don't upset the apple cart and continue to have a successful game. It's impossible to have perfect market research, all they can do is poke around a bit. Expecting anything else is folly.