I did not see any reason he should remain in Madrid. He has actually won everything he needed to win in the Madrid.
He does not love Madrid more than Messi loved Barcelona, but at a particular time he had to path way. This is the best time for Benz to find his way out of Real Madrid.
I'm not sure about the information I'm reading, I confess that I'm a little confused because analyzing only the news with less than 24 hours, in one place I read that Benzema accepted an offer from Al-Ittihad and will leave Real Madrid after 13 years, and Benzema would even have warned coach Carlo Ancelotti and his teammates about this departure.
But then, elsewhere I read that Benzema will stay at Real Madrid, and fulfill his contract as agreed with the club and that only in 2024 he could go to Al-Ittihad in Saudi Arabia.
Anyway, I don't understand why Benzema would refuse to leave Real Madrid when he can break his contract early... 100 million euros a year at Al-Ittihad is a much higher amount than what he receives at Real Madrid. In fact, if even Cristiano Ronaldo went there (obviously, in other circumstances than Benzema) why wouldn't Benzema do it too?