I think the reality is that the maker movement slowed down not because it’s hard to learn c++ but because people don’t care enough. Will maybe twice as many people participate now? Sure. But that’ll still be a small fraction of people.

I don't think it has slowed down; in fact,I think it has grown in the last few years. Sure, it is a niche - and will probably always be - but one never had such a low barrier of entry to build stuff and be creative; you have plenty of very powerful chips, somewhat usable SDKs, a ton of COTS ready to use components ranging from gps sensors to rotary encoders, and you can design your own pcbs and order them cheap from China; you can also design enclosures and 3d print parts in your own home with precision that was only accessible to specialized companies 15 years ago. LLMs are a great help not only on the code generation part, but also on the design part - as an example, I sometimes use ChatGPT to generate openscad functions, and it isn't half-bad.