first off they dont exactly need different content, old content is fun as blu mage, but if not new content, they would need new incentives.
also, my main problem with some suggestions is just that its not realistic that they would balance any job twice, in/out of duty finder.
while i would love a non duty finder monk, with more interaction with mitigation, and counter. I recognize there is no way they would commit to doing that for all classes.
I also recognize, as much as i may think bending thier core job/df design philosophies would not hurt, they have resisted it at every turn, and its unlikely they will budge on that.
so that leaves two options that i believe SE would actually choose.
1) deconstruct limited job completely. Convert blue mage to standard rules, all future jobs follow the formula
2) blue mage and other limited jobs get refined, but stay mostly seperate from normal duty finder existence.
i prefer the 2nd, you prefer the first. You have your reasons, i have mine. I'd say there is 50% chance they go your way in the long run. I'd prefer they don't. time will tell. Good luck