It's a tough thing to take. The talent was there, the skills were there, the goalkeeper was at his best, they just didn't perform. Blaming the coach is always easy, maybe you can blame him, I wouldn't be too sure that it would have been much different with another coach.
The D-corps was not good enough. Blum is far away from the best Blum and Untersander was nowhere near the game he played at the last WC. Diaz was good, but he's no Josi. And he gets compared with him. Selecting Du Bois was a mistake, but Genazzi wouldn't have made much of a difference. Schlumpf played what he's able to play, as Loeffel did. And Furrer showed how much more he could have achieved in his career without his injury-proneness.
Praplan was the big disapointment, of course. He didn't look like an NHL-player which he wants to be. Hollenstein was better, but if you want to be successful at this level you need 3 linemates in shape. I really liked the Suter-line and I hope we can see them again at the WC. The third line around Scherwey was solid, but they're no difference-maker. And the 4th line only had Rüfenacht in shape, Schäppi and Almond were also far away from their WC-play. As is Herzog who has all the tools for a great career but just plays without any confidence right now. I really like him, his play, his skills, his strength and I really hope he can find it again.
If you want to get better you have to focus on developing young players. Changing coaches brings shorttime success sometimes, if you want to grow the game and close (or shorten) the gap there are other things to do. Switzerland had great success with continuity in the last 2 decades, let's bring this back. Sometimes you win, sometimes you loose, that's part of the game. If you want to get better you have to agree on a plan and follow that without discussing about single games. If Switzerland would have scored in that overtime vs. Germany everyone would be happy.