Can't be done, scorched earth. The franchise has been thoroughly nuked. Between declaring all expanded universe & comics non-cannon forever, and them officially nullifying everything the Jedi/rebels/republic have ever accomplished in previous films with this Episode 8 blunder, they're dead in the water.
They've specifically made it so that they can't write their way out of this, prequel or sequel, without a FULL and complete retcon of 8. And that's not happening because KK and Rian Johnson are arrogant and actually still believe that it was somehow the best SW film ever.
I get mad and then eventually i just laugh.... how on earth do you permanently fxck up STAR WARS??