What's going to make a difference this time is there is an opportunity to step up for some of these players that has not existed for us in the last couple of decades (same with Chelsea). The squad is so miserable that some of these players are going to be used as backups purely out of pragmatic necessity rather than an agenda.
The original post is misleading. It might be true for Chelsea and other clubs but United have always had very good success with youth cup winning teams. Our team in 2011 for example:
Sam Johnstone - 300+ first team appearances and England international
Michael Keane - 300+ first team appearances and England international
Jesse Lingard - 300 first team appearances and England international
Paul Pogba - 300+ first team appearances, French International
Ravel Morrison 150+ first team appearances and Jamacian international
Will Keane - 200+ first team appearances and Irish international
Ryan Tunnicliffe - 150+ first team appearances
Tyler Blackett - 150+ first team appearances
Michele Fornasier - 150+ first team appearances
In addition two of the subs in that Cup run:
Tom Lawrence - 300+ first team appearances and Welsh international
Mats Daehli - 200+ first team appearances and Norwegian international
This isn't a one-off for United either. So there is nothing naive in suggesting that players in Youth Cup winning teams will go on to decent (and more than decent) careers...at least at United.