Whatta game! 4 hours and 50 minutes! I love it! Unfortunately I fell asleep at apx 1am in the 13th.

I did read the play by play text this morning. The media is already discussing changing the ASG rules to allow an alternate ending.
In a situation as last night though, hypothetically if the managers felt that they were overextending the pitchers, they could've easily swapped a pitcher with a first baseman or DH to keep within the rules. I think I remember that instance happening before. Can you imagine Morneau or Longoria pitching?! That would bring an end to the game in a hurry.
Bottom line, again, the managers have to understand that extra innings can be a possibility and that they need not pitch everyone on the team just so they get face time. (Ex. F-Rod for 1/3rd of an inning). You have 12 pitchers on each team. Let each pitcher throw for at least 2 innings and you wouldn't have this problem.