Please don't. I love that I can half-gear both NIN and MCH at the same time. I generally only play one job per role and I'm sure a lot are the same.
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I think Beastmaster (Limited) will be the next scouting gear job.
I don't know why they didn't just make Ninja share gear with ranged jobs.
Perhaps it would be possible to merge more gear types together, but have it change appearance depending on the job, similar to how the same piece of gear can look different on each gender. That way a Dex top could be equipped on both NIN and DNC, but would have a much different appearance on each job.
They could even look at expanding the system used for pre-order earrings, where they change main/secondary stats depending on the job that equips them, allowing jobs with different main stats to equip them same item. It would save a lot of armory space.