I don't get it btw. How come we don't just splash the cash on a single player if it's really needed and the opportunity arises? Not saying we should go like Madrid, Chelsea, PSG etc, but if a top rated keeper is needed and La Masia just doesn't produce the right player, buy him. We have the money...
La Masia is great and will produce many, many talents now and in the future. But sometimes the good generations are just too young to take a spot in the first team. Once in a while we can get a good player and pay a good amount of money; like Neymar or Fabregas (although the latter wasn't needed at the time, I know). If Courtois would have a limited sum in his contract, but I doubt he has it, try getting him!
I always wondered why some people at the club are so incredibly bound to La Masia or certain players they have a soft spot for. Reina is the perfect example of this. He is not better than what we currently have and is - at least in my humble opinion - not a world class keeper. If we can't groom ourselves a world beater, buy one. Ter Stegen is a great talent and in the back of my mind I do like the idea of a young and talented keeper, but when you see Courtois you know that he is thé player we should pursue.
Chelsea won't let him go whatever he wants to do, but it's worth it trying to figure out if there is a limited clause in his contract. If he really wants to come here and it is less than 50M (A LOT, I know. But that is the current market, I guess?), do it.
PS: How lucky are Atleti to have him for three years! Amazing business by Atleti, they are as a side the perfect level for him to develop. Not CL-contenders but a great team in the EL and a good 3rd in La Liga. I see a bright future for Courtois, a very bright future.