Netflix won't take a hit here.
Most people pay Netflix to watch movies and tv shows, not sports. If I hadn't checked Hacker News today, I wouldn't even know they streamed sports, let alone that they had issues with it. Even now that I do, it doesn't affect how I see their core offering, which is their library of on-demand content.
Netflix's infrastructure is clearly built for static content, not live events, so it's no shock they aren't as polished in this area. Streaming anything live over the internet is a tough technical challenge compared to traditional cable.