Riot, DON'T turn into Jagex
For all seriousness, this is exactly what Jagex did a while back when they completely redesigned the HUD for Runescape. Thousands of people did not enjoy it until months later after still getting used to the new layout. This is going to cause many problems with your current players as it may with new ones, however, listen to the community and revert the change, OR, find a way to give us an option to switch between the old and the new. I don't care if it will hinder your progress such as champion updates, patches, etc. Just don't be the company that has failed to listen to their community.
Fiasco (Haha!)