As we all know, BLU is currently a limited job as it's been stated that the job has been too difficult to normalize/fit into the standard meta without losing that BLU feel.
I know I'm not alone, however, in desperately wanting to be able to play BLU as my main, through MSQ, through roulettes, through progression, etc., and for that to ever happen, we'll need it to be normalize-able.
With that in mind, I've a bare-bones suggestion that's probably completely unoriginal that I'd like to put out there for derision and scorn - start BLU off, when first picked up, as-is, but set Aetherial Mimicry as a "required" spell to become a "normal" class. With the new Mimicry, FAR more spells should be affected, including not just buffs but debuffs, as well - as an example, Tank mimicry would debuff healing done across the board, and debuff many of the large DPS spells, (or whatever else is necessary to bring the BLUtank in line with mainline tanks.) Same idea for BLUheals and BLUPS.
Once a BLU is in the updated mimicry state, they are able to queue, run MSQ, etc. (If it's an issue, maybe lock spells during roulette instances?)
(Possibly give a toggle to stay a "regular" BLU, keeping the current Aetherial Mimicry effects?)

Ok - Thank you sir, may I have another?