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Banning a Pokemon will lead to the rise of another Pokemon that ultimately becomes the new cancer.
It happens in every tier too, not just OU. Play in RU and you'll still see the same, prevalent Pokemon that dominate that tier on most teams. PU seems to be relatively tame I've noticed, as most people there are just playing with their favorites for kicks and not for delicious smogon points.
OU just has it the worst with Lando since it's the tier of choice. More players, more potential for encountering those staple cookie cutter team builds. Smogon complains about Pokemon that centralize the metagame, but they don't ever do anything about these versatile monsters that they love abusing, unless it threatens the style of play they've grown accustomed to. Instead they'd rather ban Drifblim learning Baton Pass, when the Evasion Clause already prevents Drifblim from doing what they were concerned about.
I don't play OU anymore but even I'm tired of seeing this thing. I know banning this thing from OU would make a lot of people here happy, so I'll roll with that.