I think they would have mentioned it if 100 was going to be the final level cap, but so far this tells me they are just going to add 10 levels on top every expansion, add/remove job actions and call it a day.
So I was hoping they would set the cap at 99 as a way of saying that this will be the final level cap. You can still add/remove skills in future expansions.

They should really stop the level-creep and add more meaningful horizontal progression to the game because it has quite literally zero. I can't imagine unironically trying to level a job from 1 to 100 manually without losing my mind in the process.

But to me it's looking like every future expansion will be as formulaic as the last.