Real Madrid has already thought about these issues. They make transfers with the future in mind. That's why Real Madrid evaluates every possibility. I think after Nacho left the team, they immediately decided who to replace him with. Saliba is a young talent. If they bring him in, the team will continue their path without any problems in the future. There is only the defensive zone that will be felt missing right now. Ancelotti will be fully ready for next year after the most suitable transfers are made there.
Real Madrid are alway futuristic they also want to be better in the present and In the future and that is the reason they perform well in all seasons and any kind of transfer that Real Madrid is going for that player should be a talented player and they like young players that will will have energy to play well. Nacho was an excellent defender and if they are replacing they will replace with someone better that are the part of the strategies that Real Madrid use in maintaining their good performance. Saliba Is actually also an excellent that also plays a good defensive game for arsenal will arsenal want to release him. Real Madrid will do everything in check just to keep their defense tight because if your defense is bad then you will face a lot of challenges if fact that was what Manchester United have been battling with, so Madrid will make sure everything is very okay.
The qualities you mentioned here is the reason why I call Real Madrid the most prepared team in the laliga, the are always ready to make a difference at all time, they for quality as well as quantity, since I started monitoring how things are been donei this team, I noticed that Realmadrid management are always serious to remain in the business that's why they go for players that will still remain relevant and useful in the team for next few season and still bring in more to replace them as time goes on, as we all know already, a team defense remains their strength, so Real Madrid will always strategize to make their defense effective at all time, I have been hearing some persons saying that Manchester city is the team that can compete with Real Madrid, if this is in terms of players I will agree to an extent but when it comes to application of experience I don't think that such is correct, for me Realmadrid gat all it takes to lift champions league again this season if they could maintain their previous performance, I have know form of doubt about the present Realmadrid and i believe in their continues and unshakeable performance.