Why isn’t CO a popular FO5 location idea being tossed around?

I’m surprised more people haven’t mentioned Colorado. Maybe they just don’t know what they’re missing out on. You have the Rocky Mountains obviously. Denver has an amusement park, military base, and all the lore around Denver International Airport. There are conspiracy theories that there are tunnels under the airport and no one knows where they go or even if they’re real. Can you say Vault-Tec? Additionally, there is a town with casinos just west of Denver called Blackhawk if they wanted to bring back the gambling element. Colorado Springs is just to the south and has 3 military bases, the Air Force Academy, NORAD, and Manitou Springs (next door) is supposedly the witch capital of the states. Lots of interesting spots. Can’t believe no one has put this out there. Also, who wouldn’t love a brand new dynamic up in the mountains. Crazy weather, bears, wolves, and all.