One of the great things about Multiversity was all the teams and groups they introduced, but then nothing has been done with them...
I'd love to see the team on Earth 23 have more adventures. Having the Superman of Earth 23 being the President of the U.S. is an intriguing idea - tons to explore there.
(But I'm also the guy who wants to have a re-rebirthed Earth 3 and a title that follows the Crime Syndicate, a title that's set on Earth-11, and I'd love to see DC play around with the characters on the Marvel pastiche world of Earth 8. Considering Marvel's use of the Squadron Supreme, Imperial Guard, etc. over time, some turnabout is fair play.)