The worst possible outcome for Reddit is that this move shines light on how many porn communities exist on reddit, which causes media scrutiny, which causes advertisers to bail or threaten to bail, which causes Reddit to ban NSFW subreddits, which spells the end of Reddit.
This would probably be a good thing for the world, except for the loss of the NSFW subreddits. All the "normal" subreddits are cesspools.
How dare you say this about my /r/DaystromInstitute