I would like it if they made some type of job gauge for those jobs that need MP (like healers, BLM, PLD, DRK), and get rid of the MP bar for the other jobs.

Also, either give it to SMN and RDM as well, or make Resurrection/Verraise need some other resource. I'm sure some good ideas could be found for it.
Right now, MP for those two is just so Raise can't be spammed easily or to punish you for dying, which other DPS don't even have in that form anymore ever since TP got removed. And as we got job gauges and thus some kind of resource/stacks/mechanic to manage for almost every job, losing that is enough punishment already. For healers MP at least make some kind of sense so you don't just mindlessly spam Succor, but for RDM it's just "press Lucid Dreaming every once in awhile". It's like TP were (outside of Verraise).