Manchester City managed to win two titles last season and I expect their performance to continue in this season as their coach is one of the best experienced people. I think Manchester City will do great this season under his leadership.
Manchester City didn't win two trophies last season, they won a treble (EPL, CL and Fa Cup), and despite that outstanding feat, they are still favorites to retain all the trophies they won last season, though it definitely won't be easy. Having said that, Pep is so important for City, he is a serial winner who doesn't give any room for complacency, even as City won a treble last season, he would continue to push his players to win it again this season, that is why he is the best manager in the world.
All clubs stands the chance to win any of the trophies and I disagree with you that City will be able to repeat what they did last season by winning the treble even though they are the defending champion in the three competition. No doubt that they are good and strong,but there will be other clubs who will take this season a do or die affair.
This season might surprise people with the outcome of the matches. Some clubs that we are looking up to for a great performance might disappoint their fans and clubs that we don't expect much from might surprise us with a good performance. The most consistent and lucky club will win this season.