Just by increasing slots to African and Asian countries it won't miraculously make them better.
We saw that with Qatar, every game they played it was painfully obvious that they were not at the required level to be there.
I guess this will become a bit more common in the next world cup, where more countries will qualify that don't really have the level we are used to see in the world cup.
I partially support your view.
I believe that the Qatar team really was a big disappointment, although that is to be expected from host countries, I believed that their performance would be better.
I also agree that the increase in the number of places for the World Cup is a mistake.
However, I disagree that Africa does not deserve more space or that they have weak teams.
In the last world cup we could notice that the power of African football is above many European teams, and I don't believe that that was just luck or an isolated fact.
We need to stop discrediting African football and give those players the respect and prestige they deserve.