We can't say much at this point but I'm pretty sure that City won't win it again. They need 1 bad game in knockout stage and they will be out. Going 2years without bad game it's really hard and City does not have legacy of Real M to do that.
What gives you the impression that Manchester City won't be able to accomplish what Real Madrid did by winning the champions league back-to-back by the next season? Manchester City currently possesses the best team that can defeat any opponent. The only thing I am aware of that would prevent Manchester City from winning the Champions League by the next season is if they sold or loaned some of its important players to other teams, or even if some of their players sustained major injuries that would have a negative impact on the team's performance. Apart from that, I don't think anything can stop Manchester City from reclaiming the champions league title.