I know I'm treading the same ground quite a bit in my posts. I keep harping on the design philosophy of XIV and the way it handles. I'm going to probably do so again a bit so, forgive me.
The thing you have to consider though is what path would expand XIV the most? What features would improve it the most? If you compared jumping side by side with something like... improved party mechanics and expanding battle regimens, streamlining them at the same time, I'd say that improving party mechanics would go a lot farther in giving the game more depth. There are many ways of expanding the game, jumping included, but the question is, given what XIV is, not what it could have been or what it's not, what new features would help the most? Do we demolish what's there and rebuild it to cater to a single mechanic that may end up adding a limited level of depth, or do we take what's there and build on it?
In this case I'd say we should build on what's there instead of starting anew. Focus on expanding the game in other ways, giving it a unique experience unto itself, something it's already positioned to do.