The board didn't want to get rid of Martinez. The fans forced their hand.
I think Koeman will do better and finish around 6th-8th assuming we aren't hit too badly with injuries during the season. At the very least I think even if we are below that the fans won't be quite as toxic with Koeman because of the way we play. At least now we look like we are trying and it's also only his first season.
Maybe we won't be as toxic with Koeman because he'll actually win football matches mate