Might impact national ratings - if game 3 turns out to be a big game for the Cards/Nats they might move it closer to prime time where they believe it might get more ratings than another game in the same spot.
Also the A's might be eliminated by Wednesday (and possibly the Giants too), so they want to make sure that there aren't unused time slots based on a game that does not need to be played.
Nah. They will put the Yankees game in prime time no matter WHAT the situation is for the other series