There are a number of power we could take, but we only get to make that choice per level right now...
what if instead it were as if all classes were a 3.5 cleric... the full menu of abilities (at will, /enc, /day, utility) of character level or below were there to choose from after each extended rest? clerics, fighters, wizards, warlords, warlocks... all could just "prepare a new list" of at will, /enc, /day, and utility (more like a 3.5 martial adept, but whatever)
Would it really make a big difference in how the party performs? Most folks will probably gravitate to a "default set" of abilities anyway, but keep a finger in the book in case something was coming down the pipe that would be useful if "x"...
whatcha think? borken? useful?