Switching Venues at the last minute

I think that venue switching can really screw up people's seating arrangements. According to the twin cities tickets blog, Lyle Lovitt switched venues at the last minute, and 30 of the first row fans would have to be moved to another row. How is that fair? Sometimes, you see that happen at The Rave, where a band is moved from The Eagle's Club room to The Rave. That is easy since there are no seats in The Rave. But when you lose an assigned seat, what are you going to do?