I can see why they don't keep URF
Simply put URF is just TOO MUCH FUN.
Who would play the regular Summoner's Rift if they had the option between that and URF?
URF is silly URF is fun URF isn't stressful (except when someone forgets to ban Nidalee) URF is a place where you don't have to bother with mana URF is a place where high cooldowns don't matter URF is fast URF is exciting
Summarized; URF is like an illicit drug. It's a ton of fun, you get really high on it, everything is good, everyone is happy. But once it disappears, you crash. Hard. Suddenly regular mode has lost its luster. You miss the days of 1.6 second Shaco dagger throws. You gotta get your fix!
In short, URF is the epitome of anti-summoner's rift, and everyone loves it. Even the ARAM weirdos.
I'm sure that if there were a Ranked URF selection, nobody would ever go back to playing regular old Summoner's Rift!
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only work against immobiles.