I think MMA is still too young to have a Mecca like venue. For that you need to have fans clamouring from around the world that acknowldge the mecca venue is the best event they can go to. Like Madison square garden for boxing or Wembley for football(soccer).
The closest UFC event to mecca has to be in Vegas like the MGM. When a fan visits Vegas they remember the fights and the lucrative reputation that comes with Vegas.
The Canadian event which had a record sell out could run for one the best events with the attendance and atmosphere but not the appeal of grandeur. A fan could say its one of the best events. but it wont have the lucrative status of visiting a big Vegas event.
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