2030 looks like Barcelona or Vancouver. After Los Angeles got the summer, Utah became more likely to bid for 2034. Other potential sites look too politically iffy, due to the potential of insecure democracies: Almaty, Kazakstan; the formerly Soviet Georgia; Lviv, Ukraine; Sarajevo; Ufa, Russia... oh, and Vancouver.
Why should any of these cities want to host an economic disaster? The OC should build permanent venues instead of adding to their own wealth.