Suggestion for a new "game mode"

I have a suggestion for Riot Games to make a new game mode which would change every week/month. I would call it a "Featured Game Mode Rotation". Basically what i mean is that you would choose one featured game mode for ex. Ascension for this rotation to be available to play for a week/month. And next week/month you would choose another one and make it available to play. It is basically the same as Free Champion Rotation. I know why you don't let game modes to be available to play for a longer time and this could be the solution to all player requests that you get (for example bring back URF). Please think about this, i (but also the others) would really appreciate that.

(Sorry for my english i'm still learning)