I think Abyssea was designed to encourage people level more jobs specifically so this kind of argument wouldn't be an issue anymore.
* The time it takes to level jobs is dramatically reduced. I personally have only leveled job that were already 75 before the expansions, but I've heard it's possible to go from 30-90 in a day or two.
* The time it takes to gear jobs is dramatically reduced. I farmed a full set of SMN AF3+2 faster than my YY Robe.
* It's easier than ever to store stuff, so your inventory isn't hurting carrying around sets for jobs you don't use often. Porter moogles, dramatic inventory increases, being able to d-box R/Ex gear you don't currently use, etc. Anyone that thinks they suffer from inventory issues these days actually suffers from poor planning.
SE has never been particular sympathetic towards sentimental player attachment to certain jobs. I can't think of any events that didn't both have a "best" set of jobs and also a "lol, why would you bring that?" set. Their opinion always seems to have been, "We made a job system. Go change your job."