I'm sad you think URF is too risky to bring back in the future, but...

At least we get to play it one last time. It could be worse. Frankly i think if players quit after "burning out" on URF, chances are those players were already burnt out to begin with and just got some fun out of the game one last time. But i can understand wanting to keep your lingering fringe players rather than double down on your core addicts. Numbers mean more than loyalty when it's about making a profit, after all.

URF has been one of my primary motivations to keep playing throughout all these years. I hope you change your mind and consider it a recurring game mode - perhaps once a year, at the very least. It provides the best aspects of league of legends all condensed into a quarter of the original match lengths. And it lets me and my friends enjoy the game together despite having an enormous gap in ranks between us.

Frankly, announcing that URF will definitely never return might lose you more players than keeping it a rare recurring event ever would.