Reshuffling class/job skills to allow for intact combos and AoEs at low levels sounds like a pretty good idea.

That said, I would be totally fine with them just allowing high level players use all their skills in low level dungeons. The whole point is carrying new players through low level content anyway, they can deal with having only a few abilities as they are still new and feeling fresh, but some jaded long time player who has been playing since ARR's launch just wants to leave the group and take the 30min penalty when leveling roulette throws Sastasha at them..