I wouldn't mind seeing the Olympia move eventually, but for the time being, it needs to work on getting its legs and the best way to achieve that is to stick with a place that the organizers and fans know, which should allow it to grow.
Since the AMI takeover, the Olympia Weekend has improved each year and I thought they made their biggest step forward from 2006 to this year, so fans should expect an even better event in 2008. Once the O is a consistent big money maker, only then would I consider trying another city again.