Nah, I think fans get superconfident when their favorite team is winning and sitting nicely on top and everything related to that team gets instantly better.
Sure, but that wasn't the case with Montoya. He was great in 2nd division and in youth teams, even get call for Spain before getting promoted. He was limited physically in terms of speed and quickness and it was exposed in1st team football and then he stopped caring when it was hard and regressed rather than developing.
You can argue that Carvajal is best RB in the world right now when healthy and focused, and during youth days Montoya were far ahead of him.
La Masia being so good also played a part in hyping our youngsters.
Thing is, youth talents don't always develop at same rate, during many factors. Development is like many stages that you have to pass, and to reach Barca level very few reach final stage despite many looking good in the earlier ones