I know I've said this before, but there have been numerous back-to-back European Worlds in the last 15 years (including 2021/22), as well as one back-to-back Asian Worlds (2014/15), so I really don't feel this should be a factor.
I think Malmo has no chance, considering Stockholm was just last year. Beijing also should not be considered IMO, due to a number of factors.
That would leave Boston, Prague, and Budapest. And, considering how many Euro Worlds we have seen lately, I think this will be an easy decision.