If jobs had their own exp Bar, they wouldn't be Jobs. they would be additional CLASSES!... what you really want OP is more classes. As far as jobs go you have to take the point of view of a new player. New content for older players is tainted in a way. For new players it is something to look forward to. Old players that have done everything it's a five minute job, yay I've done it. Now I am bored again.

All will be better with 2.0, there will be loads of content. More classes, Jobs, more events, quests, missions. That is the time when every one new and old will be happy and active.