Why did they even bother putting it in the game like it is now? All I think most people wanted was to be able to start a fight at 3 orbs. It would be simple to just say it generates 3 orbs and has 1 charge. This charge does not regenerate in combat. Boom you get what you want and you don't have to make it useless.
My current mind blast has a cd of 6 seconds
Even if I used it on cd on new targets (say naz) I am gaining nothing from it. I save a fraction of a second maybe but I lose the damage done from the second mind blast I could have used within that time frame.