A little essay, if you will. Basically I'm going to explain how I would have done the merit system differently in FFXI, and from that you can imagine how the same principles could be used in FFXIV to implement a seesaw that "works."
To summarize, there's been talk about seesaws in FFXIV. We have no idea what kind of seesaws they might be, but an example that's easy to relate to is the merit system in XI. You can't merit the **** out of every job; you have to pick the way you want to balance things.
As I talked about in another thread, the problem myself and a lot of other players have with merits is not that it limits you to being teh uber at one or two things, but that it's so difficult to change your mind down the line. You can waste many hours of work by deciding to change your merits from one job to another... you have to start all over.
But then what's the alternative? Because if you allow people to switch freely, then you may just as well allow them to merit everything as much as they want. In that way it becomes an AP (BLU) system, which isn't terrible, but it does completely remove the seesaw.
A couple of obvious solutions are to allow players to retain, let's say, half their merit points. Not a complete loss, but a sacrifice you'll think more than twice about. Or allow players to do it, let's say, only once a month. Nothing unreasonable about that.
But What Would Kachi Do? (Look! I'm an allegory for Jesus!)
I would have made merits quested. You complete a certain quest, your reward is a merit. Certainly not as easy as simply requiring 10,000-50,000 xp from a programming standpoint, but a helluva lot more fun for the player. The 10,000 xp could still be a requirement, whether to accept the quest, or complete it, or just set the merit. But if you change your mind, all you have to do is quest the merit you want to replace it with, no loss of experience. And meriting becomes more than just grinding.
So this is one way in which SE could implement a decent seesaw for FFXIV. Players won't have access to everything at once or be able to change from god melee to god mage in the blink of an eye, but they won't be pigeonholed into whatever they picked initially if they change their mind. And it won't be a huge pain in the ***, but rather something that blends seamlessly into the gameplay content.
You know, or something.