Don't see what the appeal would be for them. They get the benefit of the doubt and glory that comes with it each year, for beating up on sisters of the blind and the poor in High School gyms out on the west coast. Why change now?
In addition to more money, if I'm gonzaga I'm also looking at mark few and his potential retirement, whenever that may be. Getting into a high-major conference for basketball secures their place for the long term in high-major basketball, whereas there's a definite risk that if things fall off they end up in obscurity in their current conference.