Ghash is back to 33%, you can go back to sleep now, nothing to see here.
the Ghash 51% hash power happened before. What I really concern is how to prevent them reach over 51% the next time. Otherwise the confidence to bitcoin is difficult to recover.
Right. It's the threat that matters. Bitcoin was centralised. And it remains an issue as long as it's possible.
For all we know Ghash is still operating at over 50% hashrate.