A lot of people seem to be saying we should keep ETH because there's no one clearly better. Obviously that's taking into account that the likes of Bayern, Liverpool and Barca will also be looking for a new manager and will likely get the higher rated options. They seem to have too high of an expectation of what the new manager has to have achieved.
The big problem with that is that almost every season there are top clubs who are changing manager. This season it'll be Bayern, Liverpool and Barca. Next season it might be Bayern (if the next manager doesn't succeed), City and PSG. The following season it might be Real, Liverpool and Atletico. And so on. The highest rated managers want to continue to be successful, so if we just tread water until we find 'the right one' we will continue being down the pecking order for the best managers.
We simply have to improve. While obviously it would be ideal that the next manager is the one who gets us back to competing at the top, we can't just wait for that. The next manager needs to turn things around, set up the system that the club decides we want to play, train and improve the players, etc so that we can get close to competing again. They may not end up being the one who gets us over the line, but the more they can improve us the better position we are then in for the next manager. And hell, maybe they might just end up being the right one after all.
Just looking in the PL itself, there aren't many managers in the top 10 that I wouldn't take over ETH with the way things have gone this season. Obviously the top three are out of the question, but we could get any of the others if we really wanted. I certainly wouldn't say I was confident in any of them getting us back to the absolute top, but I would hope most would have us in a better position in two years.