Fischer's tactical shortcoming are obvious, though they've been mitigated by surrounding him with the right staff. But as we discussed last year already, there's more to coaching at the national team level. Who's to say all these players we see year after year would be so eager to join with someone not as good at selling his project.
Beside, as much as those losses in elimination games were hurtful, you have to give credit to the team for reaching them. As much as Sean Simpson is revered for the 2013 run, he qualified for the elimination round in only two other instances (and qualified is big word for the 2014 olympics as all teams make the playoffs with that stupid format), and lost to Germany and Latvia. That is without considering losses in round robin games that were pretty much elimination games, like against Norway in 2011 or Belarus in 2014. These losses never happened under Fischer apart from 2016, with the old coaching staff and a team lacking quality (Trachsler-Walser-Schäppi-Walser center depth).
Regarding possible replacement, I think a full time coach is pretty much needed. You need to scout players, get in touch with them during the season (a part where Fischer's communication skills is important), keep in touch with the NHL players... things a coach busy with his club team would never been able to do. Not having a full time coach would lead to underachieve, look at the USA. Hartley may have done some good things with Latvia, but he didn't bring them to unprecedented heights. They made the quarterfinals with Znaroks and Lindström too.
And I don't find Cereda that intriguing. You may argue he has done more now than Fischer back in 2016, but he'd be replacing 2022 Fischer, not 2016 Fischer, a coach with way less tactical shortcomings. Plus he may have done decently well with a weak roster during his first few seasons, but he didn't really achieve anything either like Tomlinson with Rapperswil. And this year he doesn't seem able to exploit the potential of his improved roster, Ambrì is where they were last year. He just sticks to his brand of physical hockey, and seem incapable of using his more talented players. Maybe that would have fit well with the national team back in Krüeger's time, but not with the current roster.
And of course communication skills and knowing people count more than competences. You've never looked for a job?