If you want real innovation, you need to have the person who is really doing the asking do the vetting directly, or hire an outside consultant to do it.
Lets say you come up with a great idea. It will cut your work load in half, effectively letting half the people do the same work. Assume that means your department is given slightly more work - but not double. So your boss changes his plans to hire two more people to instead fire one person. But he won't get the credit for saving the money, you do. And your boss's salary and power are based on how much money his department spends.
Best case senario, you get promoted. You are now directly competeing with your old boss. After he lost one of his best employee (as you came up with this great idea).
Worst case scenario, the idea fails.
Why would your boss promote your innovation? No incentive.