I think they'll have a rest before more "Saga" episodes. We also don't know where the next generation of Skywalkers will be coming from, since the only confirmed scion of Anakin's lineage we have currently is Ben/Kylo. I honestly wonder if maybe this trilogy needs to end with the Republic fractured beyond mending so that in spite of the First Order having fallen to the Resistance the ideal they were fighting for was lost anyways. It puts the Galaxy in a much more interesting place politically for future storytelling, and most importantly, war.