It seems a long before players were more concerned about patriotism, while now they seek for fame, money, parties, women and trouble with the justice... So, all these aspects reflect on their final performance inside the fields. The commitment isn't the same when compared to players from another nations, which are heavily focused in bringing the title to their people.
Yes, yes, and the grass was greener and the trees were taller. Remember how many children Ronaldo has (from different women) and why he had a vasetomy. You can also remember that Ronaldinho openly lived with two women at the same time. If I'm not mistaken, modern players don't allow themselves to do this, not even close.
All this is nonsense, people are always the same and now the pressure from society is stronger than before, so at least there is more ostentatious “correctness”.
As for Brazil, now no team in the world (even the French) has such a strong generation of players to dominate as it was in those days, so there is a lot of confusion about randomness - the tournaments are short + - equal and many of the teams can win. Therefore, I see no reason to blame Brazil for anything, the only thing they are ossified about is that they do not hire Europeans. This is a serious mistake. A good European coach could achieve results with them.