I forgot Rebellion existed.
If nothing else, they could partner up with DICE to deliver a solid live content service in the two or so years following any Battlefront's release, which could be handed off to them after a year or so to allow the DICE team to start working on the next outing.
I don't think they should start with the sequel era, if they do pursue a single era, but there's a lot there they could get stuck into. If I were them, I'd go back to the OT era, and rope in content from Solo, Rogue One, the OT itself, Rebels, the Mandalorian and Bad Batch. Then I would conduct polling of the player base to see which era to hit next, with the other one being earmarked for the next game dev cycle.
Galactic Conquest is what everyone seems to want, and Capital Supremacy is halfway there already. I think it's achievable, but not if the devs have to work on three eras of capital ships at once.