The cycle will change and they will not dominate the Premier League forever. You have to look back at that time Manchester United, Liverpool and Arsenal were the most dominating teams regarding titles but all that changed when Pep Guardiola came in and coached Manchester City. Pep Guardiola has made Manchester City dominate the Premier League in the last 6 seasons, but that will surely change with time.
Arsenal were champions in the past, so are Liverpool and Manchester United. So the competition will be very fierce every season so it's natural for you not to always be optimistic about one team.
Pep Guardiola success change with dominance teams winning Primer League tittle from Manchester United, Chelsea and Liverpool, since arrived last six years he was success won 5 Primer League tittle and three time in a row by winning Primer League. Pep Guardiola smart head coach and bring positive impact for Manchester City until winning Champion League tittle last night.
Optimistic with Manchester City has better performance next season, Pep Guardiola has complete composition from goalkeeper, defender, midfielder until forward with main and reserve squad with the same qualities. Support with good financial and has much money for transfer make Pep Guardiola easy how to build the squad composition for next season.