Wild Card needs to be one game. There needs to be a risk to not winning the division, no matter how good the division you are in is.
One thing I would like to see if that if there is a significant difference between WC1 and WC2, maybe 6+ game difference, that the team that finishes that much better doesn't have to play the WC game and is treated like a division winner.
Not sure if that has been the case, but I wouldn't punish a team for being the 4th best team by a wide margin. If they are close, play the one game.