No one knows if this season could be the end of Pep Guardiola at Manchester City, but if he doesn't improve the performance of Manchester City this season, I am 90% certain he will take a break from football. I even thought Liverpool and Arsenal would end in a draw since they played upto 82nd minutes without scoring a goal, but Szoboszlai lucky free kick separated Liverpool and Arsenal, and it was enough to earn Liverpool the three points.
I do not think Manchester City will sack Guardiola. Guardiola is the best coach in Manchester City's history. He transformed City from a mediocre club into the best club in europe. The team consistently showed great dominance in the Premier League. City also won the Champions League and FA Cup with the help of Guardiola.
Anyway, it is possible that if Guardiola fails this season, he will voluntarily leave Manchester City. Guardiola is only 54 years old. He will not think of retiring so soon. He will probably want to take on a challenge with a new team.
Guardiola's contract with City ends in 2027. So even if he fails, he may decide to stay at the Etihad until 2027. Whatever, I am pretty sure that Manchester City will not be the Premier League champion this season.
Sacking a coach that's given them their greatest achievements in history over few defeats? No I don't think they'll do that to him, if he had lost like 10 matches or more then they could consider replacing him but not sacking him so early the worst that could happen is Pep Guardiola resigning by himself if he noticed that this season is going to be a blunder with him as the head coach.
I would love him leaving Manchester City with a good record, I know that if he doesn't win the league or any trophy this season he might likely resign, he's a manager I admire so much and I'll love him to leave or resign from coaching in the EPL with a good record in his last season just like most legendary managers in the league.