This is why Rian Johnson has killed the story. It's been painted into a corner. There's no Jedi bar Rey's Mary Sue, there's no Rebel Alliance/Republic. Their bases, ships, ground/material/money support, logistics, people, political support, command structure, etc is all gone. They are a spent force of a couple of dozen people.
Even in RoTJ, Luke's individual confrontation with Vader and Palpatine was in concert with a Rebel Fleet attacking Death Star 2, and another Rebel force performing a ground assault on it's force field installation. Luke/Leia/Han were part of a movement, an organisation, an army, as well as a rebellion.
How is any director going to fix this short of pulling more Mary Sues out of his ass, or simply pulling more stuff out of thin air? "Oh, planet x that we've never heard of has decided to send a significant fleet out of nowhere to help us fight"? Oh, Rey's parents are important after all. Oh, Snoke isn't dead really, Luke will come back as a Force Ghost that can do anything a living Jedi can do, etc. It's going to make the fans even more angry and make TLJ even more pointless.