You are supposing that a new manager will come in and immediatley hit the ground runing, Given the fact that only Jose has come remotely close to doing this, I would not bet on this. This is unllikely. For reasons beyond all of us, when a new manager at MUFC is appointed, he gradually gets bogged down and goes ultra defensive. I would assume that the next manager will also suffer in the same way.
Regarding CFC, next year, they are likely to decline. It's how it work at CFC. Absolutely bizarre - manager comes in and everything is bright and sunny. They win the title, then the following year it completely falls apart.
Our goals:
Lukaku - 10 goals - This guy needs multiple , clear cut chances to score. The open header in one of our last games was infuriating to watch. He headed out over the bar. There was also a 1v1 chance which he fluffed.
Martial - 3 goals - he hardly gets to play these days, which is down to Jose.
Rashford - 3 goals - he is young and given that Lukaku is a better player than him and we need goals, Rashford rightfully comes off the bench.
Sanchez - 2 goals - this will remain the greatest mystery in football. A Galactico class attacker, who can't score goals.
Lingard - 2 goals - he went through a purple patch - Messi Lingod - but he has now gone back to his true level. The guy doesn't score many goals and should only be a bench option in the last 20 minutes.
Mata - 0 goals - I have no idea what is going on with Mata. I think he is a better player than what we see, but he doesn't score many goals.
Of those, I'd say Martial is the one which Jose is culpable for. The other players are getting game time, but just aren't good enough to play for a top club, where demands are high. Had Ruud Van Nistlerooy been in this team, we'd have beaten probably all the teams we played this season, but Lukaku can't stop missing chances and we are losing/drawing, as a result.
Yet two of those players are Mourinho signings. So if we're complaining about their quality then what does that say about Jose. Remember he said our attack was fine a few months ago. You've also listed 3 of those players as mysteries on why their form is dipping. Even if they are fairly average players they should be scoring more goals than they actually are. If it's a scenario where the majority of our players are struggling then perhaps it's got nothing to do with their quality but how they're coached and the tactics we deploy? Bournemouth outscoring us in 2018 so far. Bournemouth.
My issue is that every time we have a dip in form its the players quality that gets questioned, happened with Moyes with LVG and now with Jose. That might be true for some of our players but how many times do we have to buy in new players only for them to turn to shit while at United. How many players that Jose has brought in have improved?
Ultimately you have to look at our attack, understand that Chris Smalling of all people is our 3rd highest scorer and come to the conclusion that something is seriously, seriously wrong. Smalling has out scored all of our attackers except Lukaku. Let that sink in.