Easier said in hindsight, but I would've asked Michael Arndt to write 7, 8 and 9, so you get an overarching story. Next, get some people in who notice when things don't work such as the Finn-Rose subplot, Mary Poppins Leia and misplaced humour. Last, but not least, it should never have mattered if Luke overshadowed the new characters or not because the new kids on the block are getting another trilogy and chance to shine. I like the idea of having different directors, though. I would've stuck with Trevorrow if they had the stories well thought out.