Mark my words, Manchester United will be the strongest team after coached by Amorim.
Amorim could bring Man United more success in the future, but the job is very difficult and it may take time for him to achieve the desired success. That is if he is not fired after Man United's performance in the future is not much better than before.
Well, you are being too confident in Amorim. I don't know what kind of talent he has but you are so confident that Amorim will 'lead Manchester United to a treble: Premier League, Europa League and Carabao Cup.' I just pray Manchester United will be stable under Amorim. The job at Manchester United will be tough. Manchester United needed a clear identity and Ruben Amorim was brought in to do just that. If he can help Manchester United, push high in defense, and press aggressively, even if he doesn't get immediate results, Amorim will be praised.
I don't like Ronaldo returning to Manchester United's attack. Assuming Ronaldo returns, he could take up a position on the Manchester United coaching staff, alongside coach Amorim. And also possibly become an investor in the club. So, I'm pretty sure superstar Ronaldo will be welcomed back to Manchester United.