Well the team was left to him barely strong, he took the responsibility upon his shoulders and there were few possibilities to get relief after the fall they had at the beginning of the season. Player's attitude has been affected since Zidane and Cristiano left (I don't mean RM is nothing without them) and some of them can't give or push much else after 4 champions lol. The team has to get cleaned and bring new top players, and I think that the probabilities are more with Hazard and Lewandowski.
About Solari, I'm not pretty sure about leaving him as a Coach, since he started well but slowly decreased his level though the team was awful at the moment. He has no experience to lead a big team like RM, so I'd sign a new Coach with more experience like Klopp (100% Impossible) or Ranieri.