Very simple one, can job points obtained be used across all jobs rather than each job having to gain their own points? It's clearly shown in the latest survey that most people are dissatisfied with the job point system as it is and I believe the system itself would be greatly improved by just having a collective pool of job points just like merit points.
As a result people would be able to farm job points on optimal jobs and then be able to spend the points wherever they wished. As of now there are some options for achieving job points solo, low tier skirmish for one whereas at least on Cerberus, I never see anyone shouting to form a job point party.
Woh Gates would be superb to burn up job points but solo with trust, accuracy and survivability would be a major issue against lvl 128 mobs, whereas if people could bring their optimal jobs, I'd think something like 3 DD, whm, brd, cor for example and then spend hard earned points on whichever job they'd like, people might actively party up to farm up job points.
While I don't have the jobs leveled, I'd imagine jobs like PUP, SMN, BST and RDM struggle for job points for now, as do several other jobs I suspect.