If Kloop goes to Real Madrid, it would be much easier for him to succeed there compared to when he was at Dortmund and Liverpool, regardless of whether he'll be given much time or not, there would be enough funds to build the team to his taste in about 2 transfer windows that's the summer and winter windows instead of waiting for many seasons. That aside, Real Madrid already has lots of quality in their depth, they just need a very good manager that would put them in order and get them performaning at their best again, Ancelotti have been good with this particular squad in the past but it seems he's currently lacking ideas of how to put them in order. According to your question Klopp might not likely take the offer but if given an offer he can't reject then he'll jump on it, who wouldn't want to coach Real Madrid especially when it comes with a very good offer.
That is interesting idea about Klopp possibly going to Real Madrid. You give good reasons why it might be easier for him to do well there compared to when he was at Dortmund and Liverpool.
Real Madrid already has many good players. They do not need to build whole new team but like you said they need really good coach to organize them and get them playing their best again. Ancelotti has done well with this team before but it seems like he is having trouble figuring out how to get them to play well now. And you have really hit main point about Klopp decision. Even if he is not looking to move if big club like Real Madrid makes him very good offer it would be very hard for any coach to say no.