Guardiola knows about his position and through his coach career, he doesn't want to work for clubs with weak positions and not too good player resources. We can say he took the coach position in Barcelona when they weren't in a too good situation, but it was far than a crisis and it's the first club of Pep Guardiola. A next one is Bayern Munich what dominated Bundesliga for years and had many star players when Pep Guardiola joined them. A third club for him is Manchester City, and he joined them with many available star players too.
Now, he can sign a new contract with them, or can leave the club to take a rest for one or two seasons and take a new challenge, perhaps in another league. If Pep Guardiola views that his chance to succeed in Manchester City is small, he will leave with his known style.
Everything will depend on how City finish this season, if they can't defend their Premier League title and don't achieve anything significant in the Champions League, then perhaps the management will decide not to renew Guardiola's contract, although to be honest I don't believe in it myself and even if this season is unsuccessful, they will be able to forgive him for one season. Besides, it's hard to believe that City will allow themselves to have a disastrous season, they still have a lot of time to fix everything.
Guardiola is one of the best coaches in the world and he has made a huge contribution to Manchester City so far, with all the achievements and contributions that he has achieved so far then Manchester City should have to try hard to keep Guardiola in the squad, we know Manchester City has become a team that is quite great and respected in the domestic league and also Europe so far because Guardiola work and difficult to imagine what Manchester City will become If it were without Guardiola later.
This season Manchester City are in poor and stressful form after inconsistent performances in the league, but what is happening to them at the moment should not see Guardiola sacked, because however it will be very difficult for them to find a coach who is capable to bringing the glory for team like Guardiola is at the moment, Guardiola still has not renewed his contract and it is still a puzzle for us at the moment.