I don't think we need an FNV remake first. We have FNV Viva New Vegas, we have TTW, we have FNV Extended Edition. Maybe remakes of the original games (1 and 2) would make more sense. A lot of Fallout fans never played Fallout 1/2, it can be a good choice to make a remake, an old fans get a loved game from 1998 in 3d (maybe with more new features idk), and in this time newbie fans can try an origin of the Fallout.
Maybe we will not get a remake of any kind anyway =)