It can't fall out of favor if it was never really in favor to begin with. GraphQL was a quite brief hype then a big technical debt.
You don't need a new layer between database -> backend -> frontend
So GraphQL became a backend-for-frontend layer that needs maintaince. The team knowing GraphQL or not is not what causes this, but definitely makes it worse as they use the tool, which is quite complex, wrongly.
NextJS is the "evolution" (or more like growth? as a tumor) of this backend-for-frontend approach, glued with the mentioned RSC in this post. Great recipe to fight accidental complexity all days and nights.
GraphQL federation is where the thing really shines.