Grimm's Fairy Tales Presents...

[Hellfighter 17]

Hold a saga early (a couple months in) which leads to, say, two people being chosen for Jedi training. Once they become Jedis, people will know that they can become Jedis, but you can still make it as hard to get as fusion (and more people would have fusion, but there are so many other choices to give out, y'know). Sure, these two people may get it easier, but it would serve a purpose. Sometimes you need to bend your own rules if you want it to work out.

If everyone has Jedi, it will bring members short-term, but not long-term.