If the 115 charges against them are true, no one competing on their own will be able to catch up. Pep's football IQ is undoubtedly good, but if the team is getting nasty and cheating the system, he must leave.
He said something about leaving if he discovers that the club is playing dirty, he will leave, but the tone of his voice has since changed; it appears that he is either involved in the dirty job or that he is paid to maintain playing clean. Either way he needs to go
While brilliant coaching like Pep Guardiola's can take a team a long way, if there are issues of cheating or foul play in the club, it tarnishes the sport and the team's reputation. In such a scenario, the responsible action would indeed be for those implicated to step down.