an entire year of world cup stages, then the Olympics and then world cup again. I personally think that, after all, the WG will stay in Europe, and hence Stockholm. It's hard for Italy getting them. Otherwise, there are three main chances, in my opinion:
1) Canada again, probably Vancouver (but this depends from the laws in Canada, is the referendum for Calgary bid to be hold only there? and in case of failure, is it representing an expression of all Canadian city?)
2) Lausanne, with IOC exploiting in part 2020 venues for YOG and by making a higher economic effort
3) as @phelps said, Beijing 2026, that would be very sad, meaning that the interest has gone totally down...