City's and Liverpool's winning cycle won't last forever though. Madrid were a joke in the CL for almost a decade until they decided to splash the cash on the best players in the world and the best coach in the world(at the time).
Sadly, United still have the means to do that and it won't change anytime soon. But yeah, in the immediate future, I don't see them challenging City or Pool for the title or even getting close to them for that matter.