I think EL Classico will still be exciting next season even though some of the players you mentioned are no longer in La Liga, because fans of both teams or those who really like EL Classico will definitely still have a lot next season so the excitement might still be seen though it is also true that some of the players you mentioned need to be replaced in La Liga who can at least be a bit equal to them in order to keep EL Classico tense and fierce.
El Clasico will always be exciting
we are talking about two great teams that face each other at very high levels, obviously the challenge is also that: to establish which is the stronger of the two
This encourages them to give their best and more every time, resulting in beautiful and brilliant matches