It's a shame that they decided to go down the route of Ren eradicating all the new Jedi and Luke running off to not train any more, as this is a story universe of the Force and the Jedi/Sith... and yet we are back to one or two amateur/half-trained people running around occasionally lighting up a saber.
That was the one thing exciting about Ep1-3, was finally seeing the Force in action by MANY fully trained and active Jedi/Sith... it was exciting after 20 years of teasing us with two slow old farts and a half-trained kid in Ep4-6.
I was hoping/expecting to have a dozen or so Jedi in various stages of training in Ep7... after all, that's what the title implied to me (the Force was reborn and the Jedi order was being re-established).
Luke appears to be the last person who has any real knowledge of the old ways of the Force, and if he stops passing on what he knows, or gets killed off, anyone new will just be Force sensitive and never be true Jedi (without hundreds of years of re-mastering the skills and abilities of their true potential - like Rey needing to be told of a couple of tricks, which saved her life at the end of the Movse, because they don't just automatically know what they can do).
One thing I'm hoping to see in the next movie (which I was really disappointed that I didn't see in this one), is Leia being confirmed as a fully trained Jedi, from her Brother during the last 30 years. She should be as powerful as Luke with the Force, and a long time has passed since ROTJ.... so Luke would need to first pass on as much of the old Jedi knowledge to someone close or trusted, before going off to hunt down new Jedi padawans all over the galaxy.
She doesn't need to be a master saber wielder or be active as a Jedi in the film, but I think it would have been more exciting to see her written into a situation that showed her using some sort of Force ability, or reveal her very own hidden lightsaber to defend herself or someone else before going back to being a supporting character at their secret base for the rest of the movie.
Maybe (hopefully) that's a major plot point of the next movie, as she has to exact revenge for the death of her husband, by needing to kill her son in a duel. (because Ren is not a worthy or interesting enough villain to be around for a whole trilogy like Darth Vader... Darth Maul was a more interesting villain, and he was "killed off" after one movie - if you only go by the Movies)