That's not all because of Brazil's coach. Even the best coach in the world still needs some players and which is not something they have in Brazil after they lost players and legends like Ronaldo they couldn't find any other player to replace these legends even players like Neymar couldn't stable enough to achieve something for their national team in the world cup.
That's why I said the golden age for Brazil is over.
Brazil's golden age is over (because that golden generation is gone and not just Ronaldo), but I don't agree that a coach can't do anything if he doesn't have Ronaldo. Such players appear once every hundred years or less, and if you wait for such conditions, you can never achieve them. Many more modest teams have won the title through team play and not through the individual qualities of the players.