we lost maradona too he forgot him
And we actually lost him prior to his prime. He was 24 at the time.
Then let's remember what happened after that -- we won La Liga in 1985 and then it was 5 in a row for Madrid.
Let's also remember what happened after we sold Ronaldo. We bought Rivaldo and Kluivert as replacements (Rivaldo should have been an addition, not a replacement though -- imagine those two together with Figo on the right...), we won two La Ligas with Van Gaal, but we actually declined massively while Madrid recovered from the Cruyff years and won 3 CLs in 5 years. And it was only when we bought Ronaldinho that our fortunes were reversed.
We have never done very well after losing the best or soon-to-be best player in the world.