I would love a New Vegas remake. I think the old games would be too hard to reimagine in 3D, but New Vegas already has that covered and has the same feeling as the old style of Fallout. And it deserves a proper remake as too much of the original vision got diminished by technical limitations (the strip being in 3 parts instead of one huge strip), short development schedule (Legion and House being somewhat underdeveloped) or both (Ulysses was originally supposed to be the legion aligned companion but he was too big to fit on the disk and they didn't have time to reduce his size, so he got cut from the base game). There's probably a lot of untapped potential in New Vegas to feel fresh while still feeling like New Vegas.