A poll where? On the forum? That doesn't get all the folks that use 'em in-game but don't follow the forums. In-game? How?
Nope, in the MOTD, just like voting on new a/c

"Which of these skins would you REMOVE?"
Which would you
not remove?

Not the right subject for a poll, I'd say. I would think it takes more work because of that.
Anything worth doing requires effort.
Logic only dictates that skins are swapped, rotated, or the number of slots available for player skins is increased.
Otherwise, I would think that skins that are made for an aircraft that has a full quota already would sit in perpetuity and never make it to game.