SPOILERS BELOW:
Well, then, no, it doesn't look like Crest has much of a chance. Even if Maytag and Bernadette were to split up, which is unlikely but possible, I don't think Maytag has any real romantic feelings for Crest. She likes him, but she likes lots of people.
That said, if Maytag's going to cheat on Bernadette with a character that's already appeared in the comic, Crest is a good bet, IMO.