I confess I had the same concerns, but I’m not worried anymore.
I agree that Vlad is responsible of many things (like approving modifications on the main repository),
And this can give some anxiety, but since the project is now open source you can already count on some community members.
Somebody forked the original source code to give us an alternative, while somebody else actively worked on Solar2D to improve it.
Yeah, this community is small so it doesn’t give the sense of stability as a big engine… But this is still a solid reality and I think we shouldn’t worry until some games are still running.
Personally, I have published my 4th Solar2D game and I’ll be publishing another one this year!
So, in conclusion,
I think the realistic vision is: there will be slow and few evolutions in the next 10 years, but we can count on this framework as is. It will survive us!