I think there have been some talks that basically they are going to re design the whole thing because the 2022 world cup was actually quite interesting, so they want to keep the current format.
I'm not sure how it will end up being in the end, but hopefully they actually come up with something reasonable because there will be so many countries now.
I think having more matches would mean more fans, and more games, more tv income and even maybe more merch sales as well. All of that combined there is more money to be made this way and I think Fifa only cares about that. If you can make more money, then find the method that gives you the most money.
This is exactly the reason I say that it will eventually be 64 team thing, for a while that is as high as it will get, I doubt it will get any higher but we will see that. Why? Only reason; money. Because 64 teams means even more money, and easier setup as well, like 2 teams from each group means 32, then face each other to 16 and then quarter then semi then finals, simple method and will happen.