They aren't concerned about Galactic Legends. Even though they claimed that GL's were the "top tier" of characters, they've put all their energy into building teams that destroy GLs.
Maybe we'll get a lifter for JML in the future, maybe not. More likely we'll get more characters and teams to beat GLs on auto because they don't care about GLs anymore. GLs probably won't be making them as much money as this new stupid era battle setup in which they expect us to pay to build characters before we can even use and test them. (But then, CG doesn't test them either so I guess by their logic, it makes sense.)
In 3s you can still use JML for "certain" teams with JKL and Jedi Cal. Or even Hermit Yoda. In 5s it'll be a bigger question though, but there are still quite a few other jedi to work with.