Should URF be permanent?

Riot has openly announced that the only reason they don't implement URF often,is due to the fact that it causes them to lose users.
Most people are going on a frenzy with URF for a couple of days,and then they burnout and leave League for a while,sometimes forever.

The fact that it still comes back from time to time under a different form is only due to the players' constant request.

Company marketing wise,it will never be a permanent game mode.