How does Zidane quitting Real Madrid affect all other top teams? The house of cards about to fall

Right now it's easy to say that Real Madrid have been the top of the top in Europe, but after less than 3 years in charge Zidane quits the team and leaves a big void out there for everyone else and many unanswered questions.
 

1. Champions League back-to-back-to-back Champions just lost their boss, the end of an era ended in the worst possible way?

2. Rumors say he didn't want to be the one responsible for the transition of old and getting new key players in Real Madrid and instead chose to retire for now as the biggest legends you can imagine but where does that leave Real Madrid for the next season?

3. Is Zidane a coward for leaving as soon as a big change of generations/key players coming or is he playing 3d chess and keeping his legacy?

4. Many older star players such as Benzema,Ronaldo,Bale,Kroos are all looking now to be possible transfer targets, who can take advantage of the unstable situation in their club?

5. Who will take the hot seat of Real Madrid now?

6. This might be the biggest transfer window in the last 10 years or more, is there any chance that Chelsea gains something very special from this recent event?

7. Will Florentino Perez spend big now and invest in a totally new set of key players himself, is our Hazard still a target?

8. The best students of the school of Lippi looking to take a break, or swap positions?

9. In times of peace, prepare for war, did Chelsea just get a big time boost for this transfer window when it was already looking too slow given our manager status and Roman visa problem?