Brazil spent something like $250 million on the stadium in remote, amazon basin Manaus. The roads in aren't sufficient, so they had to bring materials up the Amazon by barge. That stadium was used for 4 games, and now sits empty. It is one of the most glaring examples of waste and misallocated resources ever.
Most of the larger BPL stadiums in the UK seat only about 20-30k, with the exception of Old Traf as noted, as well as Emirates (60k), and a couple of 50k stadiums. Still, the UK could pull it off easily.
http://en.m.wikipedia.org/wiki/List_of_Premier_League_stadiums
The USA hosted the event in 1994 and easily had the infrastructure in place to do so. Things have only improved since then. The easy fit for hosting here is that american football stadiums aren't being used during the summer, so they are all available, college and pro. That means somewhere in the neighborhood of 50-75 very large and modern venues are instantly available; many without significant alteration for the games.
http://en.m.wikipedia.org/wiki/List_of_American_football_stadiums_by_capacity
That said, I fear this action will kill the 2026 bid (out of spite). I really wanna take my kids to a World Cup game.