Selling Cristiano Ronaldo and replacing him with Mariano Diaz must be the most stupid decision ever made in football. I know they have Bale and Benzema as well and that Diaz is a reserve, but it’s never going to be the same. Lopetegui looks like a loser and ends up as a loser. See how far greed takes you in this game... he’ll sadly end up with enough money to live in luxury for as long as he lives.
I'm not fan of all the decisions that have been made during the summer, but I feel the situation is really not that simple.
Ronaldo has been sold after being 9 seasons at Real Madrid. His best years belong to Manchester United and his former club, where he has won 4 Champions Leagues in the last 5 years. He's 33 years old. Every club's dream is to sign stars before they start to shine and sell them before they start to decline, especially if they demand very big wages in their final stage. Also, if your squad has a few players like these, the transition should be made in the less tragical way for the club. Marcelo, Modric, Ronaldo, Ramos are way too important to be substituted in a very short period of time.
Also Mariano is not Ronaldo's substitute. Ronaldo's substitute will probably be Hazard and/or Neymar in one year time. Hazard would be way cheaper with one year remaining in his contract, in case he doesn't want to renew. To make a transition things like this are quite important as well.
Having said this, some of the supposed stars at Madrid have been very disappointing to say the least. The squad is way worse than 2 years ago, but not as bad to lose vs CSKA, Levante and Alaves. I think that off form players, some injuries in some key positions and bad luck with the chances have also played a part on this.
Don't get me wrong. Ronaldo has been/is one of the best players ever, but as much as I would have wanted to, he won't last forever.