I don't think he needs to change the fundamentals, he needs to tweak it that's all. He needs to remember that every other manager in the league has been watching, learning and thinking about what he's been doing for the last 10 years and copying him. In effect, everyone is a Pep now!
I don't think we can just ride this period out. If we do, we won't win many games this season. Please believe me I don't want Pep out at all, I want him to stay and he's easily the best manager around. However, he needs to sit, think and learn. We can't keep doing the same things expecting it to be different. Too many teams have beaten us doing the same thing.
Pep needs to now take a bit of Dyche, a sprinkle of Slot, a dash of Arteta and tweak his ideas to take in the best of them. it's literally what Klopp did - copied Pep. Teams and managers take in inspiration from anywhere. I've said before we need to get back to basics - stop conceding goals for a start. If we keep playing Lewis in midfield then we should expect every team to score at least 1 goals against us. I think the sensible thing to do is to play a deeper flat back 4, keep the passing, but make sure we don't concede stupid goals. That then means our quality has a chance of winning a game. I don't want Pep out at all, but he is going to have to realise that his team will only win games once he's changed something in it.