tts would be an interesting case-study. it hasn't really been in the lime-light, so could serve as a leading indicator for what will happen when attention to text generation inevitably wanes

I use Read Aloud across a few browser platforms cause sometimes I don't care to read an article I have some passing interest in.

The landscape is a mess:

it's not really bandwidth efficient to transmit on one count, local frameworks like Piper perform well in alot of cases, there's paid APIs from the big players, at least one player has incorporated api-powered neural tts and packaged it into their browser presumably ad-supported or something, yet another has incorporated into their OS, already (though it defaults to speak and spell for god knows why). I'm not willing to pay $0.20 per page though, after experimenting, especially when the free/private solution is good enough.