Rather than utility scaling with AP, it should scale with a completely new stat
I don't have any ideas for an exact number for ratios or items (that's for riot to decide). But the general idea is having both damage and utility scale with ability power creates a risky situation for certain champions to be too powerful in both categories when ahead, but dangerously weak when behind. With a new stat for utility to scale off of, the former would be little to no worry since it would be difficult to get excess amounts of AP and this new stat. It will also allow for much more dedicated utility itemization that will be good for supports, tanks, and utility mages that doesn't overlap too hard with damage dealers.
Thoughts?