pablumatic said:

Didn't Yoda tell Luke to pass on what he learned in Return of the Jedi?

Han talks of the Jedi as if they're regarded as myth in the trailer.

Is this movie really making our heroes as lazy as I fear? 30 years on they're still fight imperial types and Luke has seemingly trained nobody else in the ways of the Force.

There's most likely going to be a very good explanation as to why Luke has gone into hiding. And if he wen't into hiding shortly after ROTJ then he would really have had the time to train anyone, and Leia didn't exactly know enough to train any herself.

But then again, there could still be a small amount of Jedi. I mean just because a scavenger on an outer-rim desert planet has been affected by Imperial propaganda and hearsay, doesn't mean that no one at all in the galaxy know of the events of the OT or the Jedi and the Old Republic.
This film, could have chosen a plot-line similar to the EU where the galaxy is split into two factions, one influence by the New Republic and one controls by the New Order. In that case Luke might be a household name on for example; Coruscant, while on Jakku he's a mere legend/myth.