To those arguing in favor of this: where, other than the disneyland-esque Vegas strip, is the Mojave civilized? As in, where are there cities?
Well no cities, but many towns are not much worse off than rural towns in America, although you could argue that isn't "civilization"
Goodsprings is not much worse off than it was pre-war after you save it from the Powder Gang.
Primm likewise.
Novac is a quiet little town but it has plenty of creature comforts, I mean it's a motel!
Hoover Dam isn't a city but it's pretty civilized, and the BOS bunker is also civilized. Also, you can show him the NCR and the Legion, which are two different ideas of civilization.
Westside and Freeside aren't really civilized, but they are urban sprawl, albeit in decay, like Detroit today(Again, is that really civilization?). Plus, once he's in the Mojave he always has the option to go to the NCR via the Mojave outpost.
If they had made him a companion they could have an ending slide for the MAIN game once you beat the final mission that says that he went to the NCR after his travels with you, then decided that civilization was crap no matter what it was and moved back to Zion.