I know it won't be a popular choice on this board where its constantly bashed, but I think Phoenix would be a good host in a lot of ways. PHX has world class sporting venues that are unequaled in their variety and quantity by any other city in this country.
There's the sparking University of Phoenix stadium (68K, football) in Glendale, Jobing.com Arena in Glendale (19K, hockey), US Airways Center in Downtown Phx (20K, Basketball), Chase Field (48K, baseball), Wells Fargo Arena in Tempe (11K, basketball), Veterans Memorial Coliseum in Midtown Phx (14K, basketball), plus Sun Devil Stadium is likely going to be rebuilt soon and could be the main Olympic stadium.
Additionally there are 10 Spring Training baseball facilities across the Valley with at least one more in the planning stages, Westworld- a world class horse sports facility.
Many of these facilities are already connected by LRT and more are already targeted for LRT, and by the time 2028 comes around they all could be.
The main struggle for Phx would of course be the heat, summer isn't exactly our tourist season. However if it were done in September it wouldn't be too bad at all, 100 and dry in Phx has got to be better than 80 and humid in Beijin with air so bad you can't breathe.
We in the Phx forum discussed the idea fairly in length here: http://forum.skyscraperpage.com/show...=172522&page=4
Tempe and ASU have big plans to build a huge sports facility (Tempe is already a national destination for off season training for pro athletes) along some current surface lots with hopes to attract the Pan Am games. Additionally USA Basketball will soon be HQ'd in Glendale, AZ with a 5K arena of their own.