Besides, they may believe that changing the size of the tournament could bring more attention and profit to the next World Cup. It may have something too do that this next time it will be a bigger event (geographically) and plan to do it bigger on all sense.
Bigger does not mean better, though. I remain neutral to that decision.
I have mentioned manytimes before, I remain as a strong supporter of the decision by FIFA to increase the number of participants to 48. As we have seen from Qatar 2022, some of the most entertaining matches involved teams that would struggle to qualify for a 32-team event (I am talking about teams such as Cameroon, Morocco and South Korea). Also, when we are calling this tournament as a world cup, there is a requirement to ensure representation from all the geographies around the world. Look at the map below, and please let me know whether you find this representation or not:
i am also in favor of having more teams in the next world cup, but this will not give any advantage to africa in terms of increasing the chance of winning the world cup, but it will give africa the joy of seeing more teams in the world cup , I think that someone like me who is African already know who will be the teams that will always be in the world cup even when the number of teams increase for the next world cup, senegal, morocco, ghana, nigeria, tunisia, Cameroon, Ivory Coast, Egypt, Mali, Togo or Angola will be the teams that will always be in the World Cup
However, among the three countries listed to co-host the 2026 world cup, it's only Canada that has not hosted it before, why can't they give them the benefits of doing that once and for all as they always do for the chosen country?
1 - if they keep the same model, teams will never have the opportunity to enter the world cup
2 - if only 1 country organizes the world cup, then we will never see other countries organizing the world cup, see that there are 4 years a world cup, so if every 4 years there is 1 country organizing the world cup, in that century all countries in the world will organize the world cup
As for the second point, this should not even be a point of debate, many countries playing cannot host it because they don't have the infrastructure and resources, and if FIFA would do it well, they should adjust their conditions and give more countries that are adequate for the task and have never hosted it before like Canada the opportunity.