Correct me if I'm wrong, but Star Wars never got the equivalent of a Star Trek Continues or Axanar, no long-form projects with 6-7 figure budgets. SW fan-films were already kind of limited to short vignettes. Therefore there was no big collateral damage from issuing the guidelines.
I suspect there weren't long term projects because Lucas film got out there sooner. And, Star Trek was an easy model to replicate (explore strange new worlds, etc.)