I don't know how much of the Fallout: New Vegas group is still there. Fallout: New Vegas was done 15 years ago.
But the (mainline) series has also had successful games done by different studios. Fallout was Black Isle. Fallout 2 was Black Isle -- with the leads from the first game having left to join Troika. Fallout 3 was Bethesda. Fallout: New Vegas was Obsidian. Fallout 4 was Bethesda. Fallout 76 was Bethesda.
I figure that if there have been that many handoffs done successfully, they can probably manage to do another.