Under Yoship's direction I'd say we'll keep getting more new jobs as long as we keep getting new expansions. FFXIV is able to get away with this because of the DOW melee/ranged/tank and DOM magic/healer gearset so the only work they have to do is designing the weapons; now, this will require an extra graphic artist or two but if the game keeps bringing in a lot of money it looks possible. The way Yoship talks about jobs it's as if he has a lot more ideas he wants to explore, so I get the impression he won't stop.