This has been interesting to read. The problem has almost corrected itself, and may be corrected by the time I press "submit".
Users never needed to downgrade. Miners didn't really need to downgrade either. They needed to stop producing very large blocks. And they needed to be poked to ignore the higher block, temporarily. [Downgrading accomplishes both, but I doubt that most miners went to that trouble.]
Amazing. So you read this entire thread, came away with zero clue as to what happened, and decided to start preaching to the rest of us?
Maybe try reading it again.