What about putting a velodrome in Memorial Coliseum?
Arguments in Favor:
1. It's a velodrome. If there was a bike racing track in Memorial Coliseum, it would be so packed with bike fans it would look like the Beatles came to Portland every event night. And everyone knows cycle fans > hockey fans.
2. It's not a mall. One idea floated for re-using the building is to turn in an indoor entertainment center. A velodrome is a much better idea than something that will probably be christened Nike MemCom SuperMallTM
3. It could possibly keep the inner bowl, which might not be protected by the building's proposed historic register designation, or at least build a new one in its place.