If they make a Fallout 3 remaster, which seems all but inevitable after all the rumours and the Oblivion Remaster dropping just like that, New Vegas seems a logical next step - it's a game which shares the same engine and assets.
I just hope they aren't cowards and use it to touch up New Vegas, instead of just The Same Game With Better Graphics. Restore content, bring back the original map size plan, integrate the DLCs with the main game and each other (so we can do things like telling Veronica about Christine and telling Caesar that Joshua Graham is dead and we killed him, etc), expand on the Legion, revamp the combat to be closer to FO4 and 76 in shooter action, etc. A New Vegas freed of its horrible Gamebryo early 2010s shell could likely last decades just with the mod community tinkering with it.
I also like to dream and think wishfully.