Pep Guardiola has no plans to leave Manchester City anytime soon considering he is still very comfortable coaching the team so far. Pep Guardiola might decide to leave for internal reasons or personal reasons, but I don't think in a few seasons. So far I only feel that Pep Guardiola will last as long as possible at Manchester City and will help them win many prestigious titles every season including the Champions League. It is possible as long as Manchester City helps him in many ways including the availability of a large spending budget.
If Pep Guardiola wants to leave Manchester city his next destination will be PSG since he loves going to clubs that have the money and are willing to spend. Pep Guardiola with PSG will win them the champions league very easily. With just few signings, Pep Guardiola can make PSG into a team like Manchester city but Pep Guardiola won't be leaving city just yet. He'll try to win more trophies with Manchester city and defend their champion league trophy. If Pep Guardiola was to leave Manchester city at this very moment, everything they have built in the past years will crumble.
I won't blame Pep Guardiola if he was to leave the premier league because he has basically won everything in England and there's no competition again for him. He has won the premier league titles several times (defending the title on different occasions and also won it thrice in a roll) there's nothing left to prove unless he wants to go for Sir Alex Ferguson records which he'll need to be at Manchester city to be playing in the premier to have a go at those records.