If he has said that he wants to go for the sole reason to just get more money from RM he has probably weighted in the possibility that his stated desire actually can happen. His conclusion would probably have been "if I can't get that money from RM and they sell me to Manchester United I'm fine with it."
It's difficult to know what is true and not in this story but if he did use us to get a better contract his mindset is probably that if he can't get the money he thinks he deserves from RM he wants to go. If he gets it he wants to stay.
Anyway, it's not all or nothing here. Ramos can be happy at RM and he can be happy at Manchester United.
My conclusion is that Ramos will not leave Real Madrid and I am not angry at him for using us to try and seal a better contract.
The best thing we could do is to stop competing for players that we can't have or maybe even shouldn't want to have. We should stop going for players who plays for clubs they perceive is bigger than us but which they want to leave for other circumstances. Personally I haven't seen any quote from Ramos himself saying anything about this. What Calderon says I'd take with a big pinch of salt after the Ronaldo saga in 2008. Either way, Ramos would not be interested in Man Utd if everything was good at RM so we shouldn't go for him.
Same with Di Maria. He would never have moved to us or PSG if he would have been happy at RM. Pedro is another matter because he is not unhappy at Barcelona it seems. He's just not good enough, which implies that we are not as big a club as they are. Going for players from the central and northern parts of the European continent, including France, is probably the best thing we could do in the long term. And let players from Iberia and South America, who thinks RM and Barca are the biggest clubs in the world, be. It will just be problems later on. Ronaldo, De Gea etc. Nani would probably had been trouble if he had been good enough.