If SMN and SCH are anything to go by, that's not a welcoming idea.

Don't get me wrong, it seems cool, but that's what was in their minds with arcanist being able to go multiple paths. It became a balancing nightmare as you couldn't touch, say, half of scholar's kit without also touching summoner. Let's say black mage and summoner are doing too well, because of fire I and ruin I. You can easily fix fire I, but if you weaken ruin 1, now scholar got hit, even if it wasn't doing well.