There is no way it's going to flop.
It's been top seller in Steam for months, even during big sales during which its price stayed the same, it managed to be in the top 10.
Unless there is an absolutely stupid amount of refunds they'll make money on it.
If it turns out to be an average game as it seems to be so far, it'll just be forgotten in a few months like that new RPG from Obsidian which was so mundane and average I can't remember its name instead of being treated like the absolute disaster that was No Man's Sky. There will be no reason to make this game better because no one will care.