I like the idea, but two things need to be solved, before they can add this feature.

1. Less players will be leveling via dungeons and FATES, what can SE do to make sure that both contents wont lose players?
2. Not only players, but bots will take advantage of this system, giving bots more jobs at max level, is something that we do not want. How can SE make it so, bots are not able to use it?

If these two issues are fixed, I can see your idea being implemented in the game.