I think it can go either way.
What they could do is simply reverse the systems. Skill up for physical levels, exp gain for class ranks. At that point, I don't think it matters whether it's there or not (just like skill ups hardly mattered in XI).
But what I think is more likely is that they'll keep changing it until it's pretty much like XI exp gain. They'll just take a detour in getting there, which is a shame but in the end it'll probably work out. Same as with the Marketplace, pretty much.