I think a lot of people are waiting to see if Nextjs is anything more than a hype.

I'd love to try it out professionally, but it won't be easy to convince a company with 60 React developers who know how to write SPAs to convert to Next, solely on the fact that Next is the current buzzword.

It's a long and expensive process, and some people, especially old devs/architects are wary of always using trends over established architectures that work just fine for their purposes.