Whilst I understand the desire to increase the number of teams in the World Cup, I do not think that the proposed format for 48 teams is the best for the reasons I state below.
If it was down to me, I would leave it as 32 teams as I think that is perfect, but I understand there are other considerations.
Things about the FIFA proposed structure I don't like are:
Sixteen teams will only play 2 games each.
It seems like a heck of a lot of work and effort to only play 2 games.
In each group, to have 2 out of 3 teams go through to the knockout stage is too many. The current balance of 50% of the teams in a group going through is a much better balance.
If it is too easy for teams to go through, people will lose interest.