2/5 Wins a Vote?
In Ranked, it's more urgent to win. So there's SOME reason in wanting 4/5 for a surrender. Nevermind the fact that in Solo/Duo Queue, you can simply have trolls who go duo just so they can overrule the surrender vote at 20 minutes.
But in Normals, it should be a 3/5. There's no reason two players should have the authority to waste the time of three others on a game that's hopeless or a game that they're the only ones having fun in because they're AP Quinn and think it's funny to be losing.