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He has a similar style with Zidane and when he feels enough or feels like Manchester City reach to their limits and will fall to the down side soon, he will leave Manchester City. In addition, I believe Pep will want to find challenges from another club, another league. So far he has been working in La Liga, Bundesliga, Premier League and I believe he will want to get experience in Serie A soon.
It looks like that won't happen as long as Manchester City have great players Pep can take advantage of all of them to keep playing strong and getting better.
Pep trains Manchester City not only for one or two seasons, so it has to be how he understands in detail and that way Manchester City will never experience a significant decline.
Pep is a coach with extraordinary experience so that it is also impossible for Manchester City management to just let him go when Pep is still working well for Manchester City.
I estimate that Pep's chances of going to Serie A are very small, even though as a coach his final challenge is to coach one of the clubs there. Because he will not get the same support as in the clubs he has trained before. My point is that the club's finances in Serie A are not good, what can Pep do to build his squad there, Jose Mourinho is a clear example at this time.
The biggest possibility for Pep is to rest for a while like he did after training Barca first. And that only happens if the contract expires in 2025. But all other possibilities can happen because nothing is certain in football.