It was one of the first, if not the first, cookie cutter arenas that attempted to accommodate more than one sport and was the prototype for many others around the US through the 70's. Most of them are now gone and this needs to follow.
Vegas would be great for MLS and possibly add another team in the inter mountain west for rivalry/derby action that makes MLS fun to watch. However, I wonder how far MLS is going to go with expansion with OC & NY coming on line next year and Atlanta, LA and possibly Miami in the coming years.