There is no reason to oppose replay. Instant replay should be implemented tomorrow. Otherwise baseball is saying, "Gee, that was the wrong call. Oh well. That's okay. Nobody's perfect - especially the guy we just stole a perfect game from. Being wrong and not getting the calls right are a part of the game."
Umpires aren't a part of the game. They're supposed to be independent and correct. By not reversing the call and delaying the implementation of instant replay, baseball is saying that getting the calls right is not important.
The argument that it'll delay the game is irrelevant. Last I checked there was no clock in baseball. A game can last two hours or six hours.
Reverse the call. And if not, at a minimum get instant replay NOW!
The other thing that bothered me is that this call was IMMEDIATELY known to be incorrect. By everyone involved. There was no interpretation needed. A home plate umpire, catcher and batter can appeal to a base ump for a check/no check swing. Umps can meet and confer when it comes to home run calls. Why can't they do it in other situations. Why couldn't the home plate up come and say, no, wrong call, the guy is out.