I agree that they need to split it. If this game was alt friendly even in the slightest, I probably wouldn't mind it how it is. Though as of right now there is no way in hell you'd get me to level a second char/go through the entire story/level up all the same old base classes again just to be able to switch between SCH and SMN on the fly. I'd rather they had just made them two completely separate classes at this point, and I fear for future job splits.

There are a lot of people out there (myself included) who prefer to play a dps version of a class, but is more useful as a healer/tank (or vice versa) and will gladly play those roles while raiding or running dungeons with guildies. However, they will want to then play the role they prefer to play while solo, simply for the fact that that is more fun for them. That should not be penalized. This is a game that you're meant to have fun playing, so having a mechanic that blocks having fun for absolutely no real reason makes zero sense.