Anyone fancy mindlessly speculating on the trailer yet?
The Luke line at the end is a direction that some had guessed, but it still packs a punch and feels like it makes sense for the character. If Luke tried to rebuild the Jedi and ended up just spawning a new generation of Dark/Light conflict (including Kylo Ren destroying his academy), then he might well be dejected and come to the realisation that balance in The Force isn't about the light defeating the dark, but about finding some kind of resolution. And perhaps doing so by encouraging Force users to find some kind of balance within.
If so, it would pay off not only the original trilogy but also a lot of setup from the prequels too. I like it.