- Fully established Jedi Order with Rey as a student
That would be boring.
Not if the characters are written well. Also what would be boring about a bunch of Jedi and a bunch of Dark Side Warriors clashing?
EDIT:
Also why should there only be a few Jedi like in the OT?
Because the new order is only ~30 years old and as TFA explains, Luke failed in his first attempt to train a new generation of Jedi.