Earth-2 will be joined by 'The Justice Society of America' by the years end, I'm convinced of it.
Beyond that I'm unsure of what else DC can spin out of this as yet, there are good characters here but none have that something that signals them worthy of their own book. The most likely option is of a new version of Infinity Inc at some point, or perhaps a splinter team headed by Micheal Holt once he re-establishes himself. But I think we will be seeing a speeded up introoduction of some old names made new again - Liberty Belle maybe? Silver Scarab with his egyptian connection is another possibility. A new Robotman to counter Vic Stone perhaps? Or a take on the Amazing Man...? Lots of possibilities!
You know ...... I wouldn't mind seeing "Superman Secondus" ...... how about the Earth 2 Mon-El in the role. Instead of being from Daxam ...... Mon-El is actually the son of Superman & Lois Lane of Earth 2. Mon could stand for ....... Montgomery.