Please explain how this would simplify anything? You still have the full rotation. all it does it consolidate a 1-2-3 button press into a single button. This is the same as macroing a few things together with the exception that this works with combos by automatically switching to the next button in series. If you truly thing pressing three seperate buttons is much more complex than pressing one that switches to the next in series i don't know what to say. I'm all for more game complexity, but bloating buttons isn't where it should be.
If you want complexity start trying to ask for utility spells back, or all the niche abilities they have already pruned. This is no more complex than if they split the Limit Break button into 5 separate buttons instead of it automatically switching to whatever role you're currently on.