aging did not do her well, and of course the drugs and mental issues.
Honestly if they had made movies it would have just been luke unless they got her to clean up a bit, IF not they would have killed her off after one movie, Harrison ford would have demanded a fortune and for his character to be killed quickly (he wanted out after the first one), so we could have had luke and the kids from han and leia which would have made good movies.
I agree with the prequels could have been made anytime and they should have made 789 10 11 12 5-10 years after return.
Then again for us old people, we thought they would never make another star wars after return. We call these the DARK TIMES (I was 8) and after the hub bub from that movie you could feel star wars die. The toys, no shows, no movies. I remember how excited I was when they brought back the bodybuilder star wars toys and then the prequels.
Hence why as much as I hated ep 8 im still glad star wars returned so I wont complain.