With new expansion, most people expect level increase (which, one should be honest with themselves, is pretty much guaranteed). With that comes the "growth" of jobs. New options to be had. However, button bloat is a thing.
How can it be solved?! Hypothesize, suggest, share your hopes/opinions away.
Skills cut out? Fused together? More traits in place of skills?
Personally, I would like stances (as abilities!) for all classes, but rather than "DPS stance" and "tank/healer stance" or the like, I'd prefer stances that offer bonuses that are not opposites. With each stance, different kind of "specialty" skills would be available.
For example, for a White Mage, one could have "Wind Stance" which increases casting speed and gives access to an instant, but comparably weak, targeted AoE heal (a weaker but wider and instant Cure III) and an AoE Esuna with a cooldown, and a "Water Stance" which increases healing done by some amount (dependent on speed cast increase), and offers a more powerful single target heal with a cast time and cooldown (short'ish, 20-30sec), that adds a short regeneration effect to it, and a "preemptive esuna" that prevents the next debuff or two that can be healed from being applied on target. The skills would be available only in one or the other stance, and another set of skills could be available only without stance. With only two such skills per stance, there's a total of six skills (eight if adding the stances) that can be added, at the expense of four new skills to add to the bar (the stances and the two shifting buttons).
For some jobs, specific abilities could change the stance automatically on top of their normal effect, similar to monk, but unlike for monk which goes in a specific order on every skill, only some of that stances specific skills would shift it and one could continue to remain in it otherwise. A job oriented around this version of stance dancing could be made for a new "feel", too, where half or so of the skills would shift along with whatever stance the character is utilizing mid-combat.