Bethesda lead Todd Howard says there was only one choice of studio when creating a new Fallout game after 3 – Obsidian Entertainment.
Over the last decade or so of no Fallout RPGs releasing, fans have conjured a theory that Bethesda is secretly upset that Fallout: New Vegas was the best Fallout game and decided that no one else would ever get to work on Fallout ever. And while a follow-up to New Vegas would be a welcome move given it's probably going to be 2035 at the earliest before we see Fallout 5 at this rate, I doubt there's actual bad blood between the teams. At the very least, Howard seems to appreciate Obsidian.
