Even if Obsidian or Interplay Reborn v9 creates the perfect Fallout game, with actual lore friendly storytelling and RPG mechanics it will be hated.
Why? Well, New Vegas was hated for its bugs (which is fair) but New Vegas was also hated for being too difficult and 'non-atmospheric'.
People want their character determined, they want a character some mook wrote, and they want to be the King of the World. People are literally complaining about being unable to become Elder in the BoS, even though you'd still be the damned errand boy. They want to be everything and everyone, they want zero consequence, and just become what they want to be.
I made a poll, and most people wanted a 'play after the end' rather than a slideshow telling you what has happened like New Vegas and Fallout 1 (and 2) did.
When people play as different characters they play as a good or evil. No in between. That is why, until hbomber made it clear: Fallout 3 is a FUCKING black and white game, which is just a slap to the face for everything Fallout 1 stood for. I mean the Master had justifications, did President Eden?
People who hate Fallout 4 are sadly a minority. Some people say they want better, but they are just jumping on a bandwagon. The hatred for Fallout 4 is now a 'circlejerk', and let's not 'bully the billion dollar company'.
So yeah. They cannot create a complicated Fallout game with decisions and consequences, if so, not many would play it.
I am more excited for the NV mod 'the frontier' than I ever will be by a new Fallout game created by Obsidian. That is because the developers of the Frontier can create whatever they want, while Obsidian has to come to terms with the 'bigger fanbase'.
And that's fucking sad.