The big “what if” about the Coyotes is what would have happened if the Great Recession hadn’t destroyed Westgate’s plans. They were on the leading edge of this idea. Now, every new arena over the last 10 years is part of a mixed use district. Detroit, Edmonton, Vegas, Islanders… with the sort of distinction of Seattle, which was built into an existing one (think they’re the only one not pulling revenue from the district). All upcoming construction includes one… Calgary, Ottawa. All the proposals for new arenas include mixed use… Phoenix, SLC, Atlanta, DC. If they can, renovations include a district too… see: Carolina Hurricanes.