Probably too much work and Q&A to do 15+2(?) jobs when most of them don't have issues soloing in the first place. At that point you could probably make another new job or two. Any existing solo gaps will be filled with the trust system they are adding.

They said it took a year to come up with BLU, AFAIK it's not balanced for party play and it's basically in development and maybe half finished.

I think they actually somewhat beta tested this with the logos system in Eureka. You can make slightly different builds (tanky healer, dps that can heal/raise, etc) and there are some dumb abilities you can play around with but the problem is it's in Eureka.

They could have kept BLU the way it is and added some presets of abilities (balanced for party play - so some skills might be nerfed inside content but fully functional outside) that when all learned would allow you to queue into content but not before that. It would have to be a bit restrictive on what you're allowed to take in (you can equip 24 of them normally after all and there are 49 abilities with more coming) but I think I would take that over something that is only meant for solo.