Not to sound combative, but walls of texts are bad. Break that up into paragraphs. It'd be much easier to read.
That being said, its not a bad idea. However, its unlikely they will add it. Just look at any dlc they have ever released, for new vegas as well. Take that as a baseline for what we can expect. New quests, new lands, and if we are lucky some base game mechanics thrown in. (like vampires or werewolves)
Now for the hopeful bit, modders can implement most of your idea. The idea has already been bandied about in the modding forum. Giving rare tech items and locations over to control of whichever faction your loyal to for some sort of benefit.