I think even if Manchester United want to copy Chelsea’s process of reviving their squad it will be really difficult because of United’s financial situation currently. For United to be able to make notable changes they will first need to overhaul their squad, giving way for incomings before they can make any significant changes and I think that is the stumbling block holding them from making signings currently.
That's the bad thing, and precisely what a team like MU needs most is money, as I said before , there are players who are very good who love MU, one of them is CR7, but after What they did to him , what desire would he have to help ? Or just go because he wants to see the Team at the highest level ? It's difficult , Some players or most have been sent out the back door, and that's something that is not forgotten.
For Ronaldo returning back to Manchester United to play for the second time shows he loves the club very much. Manchester United are not good with their players both on the pitch and outside, each time their player leaves the club being signed out or on loan they become the headline of the new club while returning back from loan things goes for the worse. It's a problem with Manchester United, not just financially but things might be wrong somewhere that isn't said publicly. CR7 is not who they needed to revive the club, what they need is new experienced signings and a good lineup.
If Manchester United are ready they can reshuffle the squad, since they have huge financial problems to tackle don't go for the biggest and popular on the transfer market, there are players who would love to play for the team because of the badge not necessarily for hire pay or monetary benefits.