1) It allows AZ police to collect statistics on the number of illegals that ICE refused to take action upon, which could be handy leading up to November.
2) Obama's decision to not take action is not binding on a future President (although whether Romney will do anything different is something we may have to see).
3) If the republicans take over the federal government, all it will take is one piece of legislation giving the states the power to arrest illegal aliens.
The way they first took a look at the law may give a clue how they will decide. It looked like a large order of asperin at the time. Not so crazy.
What seems lost to many is that the most critical part of the bill, Section 2B, was upheld.
If I were Jan Brewer or the governor of any other state that has passed an immigration law, I would go to the Pubbies in Congress and have them declare Obama's "dream decision" unconstitutional, since it was done by fiat and not through an act of Congress, which the Constituion clearly requires.
Of course, this reveals my own "dream act": Pubbies exhibiting courage!
Arrgghhh!