I think the next fallout should be on the coast so its referred to as The Coastal Wasteland. It doesn't have to be, but Miami would be a good spot. the surrounding areas could be Key West and The Everglades. The character could be called The Hunter and he travels the coastal wasteland and whatnot. There would be 4 armies: Miami Blues=cops/Miami security, Northern Lights=super advanced soldiers from Barrow Alaska, "The Tip of The World". Miami Pirates=pirates that cut off supplies to Miami, Sunken Souls=just to add a new type of enemy and/or ally Sunken Souls are bodies of people that died at sea or in the surrounding area when the nukes went off. It had a wierd effect on the salt water and preserved and awoken them like zombies, but smarter. They speak to eachother in creepy whispers and say they want their city, their home back, obviously Miami.

And then the five attatchments:

Atlantic Memories: It takes place entirely underwater as you dive with a treasure hunting team to see what you can find. You get to see the beautiful underwater flora and creatures and scenery. Just watch out for sharks...and Sunken Souls.

The Quiet: Takes place in Bowdon Georgia, a town in the middle of nowhere that has become lost in time and silent as death. There is no music, no companions, and nobody to hear you scream. Face the horrors of The Quiet and listen to the heightened sense of ambient sounds of your environment.

Cumberland Island: A beautiful Island off the coast of St. Mary's. A place untouched by the nuclear fire. You join a couple of adventurers to find a mythical creature said to "show you the past", when you become involved in a huge drug deal gone bad. You must work with your captors to survive against not only other people, but a legendary monster that caused a genecide.

Scenic City: Chattanooga Tennessee was once a beautiful city with views that stretched for seven states and a city full of art. The river that runs through the city was once the most polluted in the world, then became cleaned, only to become the most filthy and monster creating river in existence. You must fight off the Deadly Dreamcatchers as you find a way to end their threat on the world and clean the river.

Drown: You are kidnapped and taken to the deepest trench in the ocean floor, to an underwater prison called, Drown. Hundreds of prisoners are housed here by the psychotic and enigmatic Warden as he holds you for reasons unkown. How far are you willing to go to escape from the most secure prison in the world? Just how far?

Your not alone in wanting Miami as the setting for Fallout 4. This is also my choice and I notice others are welcoming to the idea.

It has a beach, it has a city and best of all it has the Everglades national park which means swamps, alligators, pythons etc.
Potential ideas in the game could be air boats / swamp boats made to run on micro-fusion cells, a city gang dressed in Miami Sea Hawk colours, Cuban / Caribbean music, palm trees...... so many ideas

Miami also has a major cruise ship port and in a time of war could I guess also have a major US Navy and Marines Corp presence