There are no justified sporting reasons for such a decision, but only reasons of a financial nature, and that is precisely why I am sure that FIFA will make such a decision
For a very long time, FIFA doesn't care about football or football players, they are only interested in making money, and with more national teams in the world cup, the income from the competition increases.
I don't think anyone needs to be overly explained that because of such a decision, the quality of the competition will drop and that we will see more weak and boring matches.
After Qatar became the host of the World Cup in a very suspicious way and the previous president of FIFA ended up in prison for corruption, nothing can surprise me anymore