Well, at least they are doing something.
I feel NMS is exactly the type of a game that would benefit greatly from the development approach that was employed by the devs of Minecraft or Kerbal Space Program. Start small, get players involved early, try to find out what they expect from the game, don't overpromise, let the players do your advertising for you, develop the product gradually with the players' wishes in mind.
Not that it's a failproof way of doing things - Planetary Annihilation comes to mind - but this approach seems to work pretty well for huge open-world sandbox games, at least. You can't make a game like this in one swoop - not if you're a small indie team, anyway. And now that Hello games have lost the fans' faith, they might not have the chance to finish what they started.