I do not know if this is even remotely possible but I honestly think it would be cool to see a fallout game that covers the entire U.S. not in one go of course but in addons weather they be downloadable or in disk form for p.c.
start either in actual time zones or even break it up more, for example the first part covering the north east, then central east, and then south east, continuing westward in each addition, bringing into play the major areas of intrest like D.C in Fallout 3, having some kind of transportation concept like they had with the Pitt DLC to bring up the obvious constraints to travel and the unlikelyhood of bringing in some kind of mount like a horse that has been mutated like the brahmin. have some lost military instalations that your character may come across like N.O.R.A.D for instance where you may find some random weapons that are in exelent condtion aka like new, and or even finding some kind of vault tech master map where it would show where every vault in the U.S. is located and a master code to be able to use to enter the lost bastions of humanity if they haven't yet opened or are also undertaking the same experiment as Vault 101. I also would like to see more ways to potentially join up with the different factions, weather it be the conclave, brotherhood, outcasts, raiders, or even slavers, maybe even the ability to help build up a new setlement, and have it show it changing over time as you continue brining in new people to the area, trade caravans, and such.
yes i know this would be a major undertaking
yes i know many of you may even think this is completely stupid.
and yes i know there may even be a flame war coming my way for this posting.
but this is just what i would love to see so it is my opinion and everyone has one and is intitled to there opinions

IT may seem like a good idea, buuuuuuut.......

Development time = a lot of years.

Probably see the PS5000 before we see anything like this.

http://www.gamesas.com/bgsforums/index.php?showtopic=1067662