Limit/merit was a great system in FFXI, and I could see them bringing it here in similar fashion. OP suggestions aren't bad, but let's look at what such a system REALLY is. An extension. A time sink, something to keep players busy for a while until whenever the developers want to release the next thing. It's a way to feed progression. Right now, we've got new things, a new level cap, new ilvl cap, new raids, new continents, a bunch of new, new, new. Limit/Merit didn't come out in FFXI until the 3rd expansion, at a point in time where power had been capped steadily at level 75. Perhaps it was a way to introduce more power without having to rebalance a whole lot? That was my speculation at the time and I think this holds some truth. But I can see them bringing it to 14, and I wouldn't dislike it either, just not right now, it wouldn't feel right.