I didn't check the history of the last World Cups but I think Brrazil never failed to be in the World Cup and think this time they won't fail again. However, they had the worst performance they couldn't have and the next gams from Brazil are unpredictable because they are going to use a new coach who is totally unknown to the non-Brazilian people but I think if they fail their coach and the people who chose him will be under pressure.
It seems that they have never failed to qualify for the main round of the World Cup and also agree that this time they will not fail to qualify again, it's just that their not-so-good performance has raised concerns that they will fail but that worry will be answered soon when the qualifiers are held soon, and whether their new coach will be able to show something different to lift Brazil and improve its position in the current standings.
What is quite curious is that after Carlo Ancelotti will not coach Brazil, who will coach Brazil because we know that their current interim coach, Fernando Diniz, will only be there for a year before the CBF appoints a permanent coach, and there are still no rumors about the names of those who will become permanent coaches for the Brazilian national team and of course he must be someone who has very good experience and it would be better for him to be a Brazilian who knows the characteristics of the Brazilian game.