I was just about to make a topic like this, lol. Needless to say, I wholly support this idea! Having to muck about with my action bar makes me less likely to spontaneously play my lower ranked classes. Instead of, "oh hey, I could kill those mobs on my R20 CON while on my way to do r40 leves on my THM!" it is, "no way am I messing up my action bar for 5-10 minutes of play."

Considering how one of the highlights of this game is supposed to be the ability to change classes easily, I was really surprised that when you change your class the game doesn't just "remember" and simply change your action bar back to whatever it was the last time you played that class.