Of course the vote isn't on the 18th but the Maloofs have to file their request by the 18th of they want to move the team.
IMHO, if it gets to that stage, the Kings are as good as gone. Owners are not going to turn on one another because they will again have to rely on each other down the track. Its that simple. They have always looked out for each others interests and majority rules.
IMHO, there is no way you can convince 16 owners that moving the team to Anaheim is a **** idea. The issue here is that all of these owners know how long the arena issue has been hanging around Sacramento and majority of them like Maloofs. They will feel symphatetic to their cause. If the Kings were moving to New York, Buss and Sterling would vote YES but because they are proposing to move into their market, they will strongly oppose this since it affects their finances.
There might be questions asked about Maloofs finances but legally, they can't force them to reveal their bank balance and they certainly wouldn't want to block any move because they think Maloofs are struggling financially or that opens a can of worms that no one want to touch.
Like I said, the best possible chance for Sacramento is that the parties fail to reach an agreement by the 18th and the deal falls through, or there is some sort of legal fine print somewhere that ensures that any resolution to this action is prolonged passed 18th of April.