Or even set on retiring? While it's true that we have no idea how easy or hard it will be to go from 75 to 99, or what new abilities they gain that high (besides subjob's abilities), it's not unreasonable to assume any one job will break out of its current niche, whether it be in the DD pecking order, unique support role, or what have you.
So, any job you're hesitating to grind? For me it is SMN. I know with Astral Burns that may be the quickest job to level to 99, but as I've been trying to cap summoning skill for over a year, I can't see myself committing to skilling that up to a decent level. And unless they make radical changes to SMN, it still won't be highly prized, especially after losing its monopoly on Hastega. I could spend a few days burning SMN to 99, but without a need for it, I'm thinking of retiring it at 75.
How about you?