This allowed them the option to start CC Sabathia on short rest in Game 4, which in turn allowed him to be available for a possible Game 7 on regular rest. Since the Angels have four capable starting pitchers while the Yankees truly only have 3, the series playing out according to the schedule was a big advantage for the Yanks.
They will have to get lucky once again in order for the rain not to wreak havoc on their plans. The Bombers can help their cause greatly by winning Game 6, whenever it takes place. Should the game tonight be postponed, it would be annoying - especially for the fans and writers - but it could have some actual unfavorable ramifications on the team should there be a do-or-die Game 7.
Having to play a pivotal Game 7 would be awful because the Yanks would need to start CC Sabathia, thus making him unavailable until Game 2 of the World Series (should they be fortunate enough to win that game). It would be especially bad if tonight's game was pushed back until Sunday (partially because the Giants have the 8:30 PM game on NBC), but mostly because the extra day would allow the Angels to start John Lackey on short rest and Sabathia wouldn't be available until Game 3 of the World Series and wouldn't be able to make two starts unless the Series went 6 games.
The Yanks have two more chances to make it to the World Series, but it would greatly behoove them to take care of business as soon as possible. As ridiculously exciting as it would be to witness a Game 7 for the rest of the baseball viewing public, no one with a vested interest in the Yankees wants to endure the stress of watching them play with the season in the balance. Let's hope they can walk between the rain drops once again.