China will get the World Cup in 2026 if they are anything close to ready to host. FIFA is dying to give them the tourney. Huge market. Big money. Football-crazy population and the WC has never been there before. If Brazil and SA can manage the infrastructure requirements, there's no way China is coming up short.
We're looking at Russia in 2018, Qatar in 2022 and China in 2026. After that, FIFA is going to be under pressure from the old guard to bring it back to western Europe since it will have been 20 years since the tourney was played on the Continent.
That means it's 2030 before the US can realistically expect to win hosting rights. The Dome and/or its replacement might be too old. Australia gets shafted in all this. In a just world, Qatar is striped of 2022, but it will never happen. FIFA and a lot of other people don't want people asking more questions than is necessary about how it won the bid. No way they are going to set off a feeding frenzy by changing their minds now.