It's important that there's a benefit to them giving up something they wanted. If the reviews don't get better after they gave up forcing PSN, then Sony would have been better off keeping the requirement. Other companies would look at this situation, and think that once Sony made the initial mistake, they would have been better off doubling down instead of backing off.

You're wanting this to be an example of "don't make stupid corporate decisions or you'll get punished", but that I'm very confident that companies will still make stupid decisions because they're so out of touch they don't realize their ideas are stupid. Instead it's easier to get good results with situations like this if companies see that there's a way out: to do what the people want and get their review score back.