I too don't expect the Jazz to ever leave downtown SLC, Larry Miller was dedicated to the Jazz as part of Downtown SLC and he saw the vision and purpose behind building the Delta Center in downtown. I think that same vision and dedication has been passed along to Greg, and I know Gail has it too. Will other locations fight for a new Jazz arena? Yes Will they succeed? I don't anticipate it. Many NBA teams across the country made the move to the burbs from a downtown arena in the late 70's and 80's and have since returned to downtown, because they realized the synergy that is created with a downtown and an nba arena, combine that with concerts and other events.
It's not fare to compare moving the NBA arena to the burbs and the building of the Maverik Center in WVC, or Spring Mobile on 13th S. Both facilities are minor league in their respective sports, and minor league teams, even in downtowns struggle to fill to capacity on a regular basis, much of the attendance and subsequent economic development surrounding sporting venues is based on the level of competition. The Grizzlies were and IHL team when the E Center was built, then and AHL, both comparable to AAA in baseball, they are now ECHL which is comparable to AA in Baseball. Even if these stadiums had been built in downtown, the resulting economic development would have been sparse, possibly even more sparse than what has occurred in WVC around the now Maverick Center. While RSL is the premier US soccer league it doesn't compare with the overall fan support that the big 4, has, at least not at this point. MLS, minor league hockey and baseball just don't have the draw that NBA, MLB, NFL, and NHL have. If a MLB stadium had been built where Rio Tinto is, the following economic development would have most likely already taken place or would be in the process.
With that said however, downtown venues tend to spur much more economic development near the venue than suburban ones do.
Randy Rigby, President of the Utah Jazz, has stated several times that ESA still has a 10-15 year lifespan. The have capacity to add suites, and I wouldn't be surprised to see an exterior remodel/expansion occur in the next 5 years. SLC in 10-15 years will be a much different place (especially if I get on council

) and the allure of building the new NBA arena downtown will be that much greater.