The advantage with European teams is that they have the best football leagues in the world. This means that their younger players get a chance to play with some of the best in football. This is a luxury that is not provided to the younger players in CONMEBOL, AFC or CAF. However, the situation is changing now, as Saudi league is gaining a lot of traction. Even then, it is just this one league in AFC, while all the other popular leagues are in UEFA. And despite all this, some of the UEFA teams are in continuous decline (Germany, Netherlands, Danmark.etc).
Yes this is true! Many young European players have a great possibility of playing in some European team, of course, there are teams that are the elite of Europe, but there are also teams that are of a lower quality.
For a young man to play for a big club, it will depend on his performance, opportunity and also on his manager.
In the last world cups, I confess that Germany played below its potential, it is far from being the team of the 2014 cup, I could even say that the German team is in decline, another team (outside Europe) that is also in decline is Brazil, they will hardly have another team like the 2002 or 2006, for example.