I'd say JSA is probably the project that suits Robinson the best, but I'm a bit worried of his treatment of early Spectre, assuming that it's one of the characters starring (I'd rather he not be).
His portrayal of him in the latest JLA arc has been, well, the less said about it the better.
Either way, like I said, I think the JSA being on Earth 2 is a great ideea, like this poster has put it:
Good. The JSA works best when they have their own world, their own history and their own adventures. Teaming with the younger generation is fine once in a while but living in a world where they're fossils beholden to the younger generation for "rescue" most of the time just doesn't serve them, and their presence needlessly complicates some of the basic things about DC history that new readers think they can assume (like "Batman, Superman and Wonder Woman came first"😉.