A 64-team tournament has two main plus points: a more natural format, and more opportunities for emerging nations.
It is the latter which Infantino is championing, especially after the heroics of Cape Verde.
Fifa faced criticism before the tournament, with suggestions the additional teams would not be competitive.
Then Cape Verde drew with Spain and Uruguay to finish second in their group. And the Blue Sharks gave Argentina an almighty scare by taking them to extra time in the last 16, before losing 3-2.
But the fairytale stories must be balanced with the competitive edge of the tournament.
Haiti, Iraq, Jordan, Panama, Tunisia and Uzbekistan failed to pick up a point – and this summer’s group stage had minimal jeopardy for the top nations.
Add more teams and it would be difficult to see a repeat of top-four seeds like Belgium (2022), Germany (2018), Spain (2014), Italy (2010) and France (2002) failing to make to knockout stage.
Then there is the question of where the extra places would go.
Based on this year’s qualifying, these are the additional countries who would have made it into a 64-team World Cup 2026 (with their Fifa ranking at the start of the tournament in brackets):
AFC: Indonesia (118), Oman (79), United Arab Emirates (68).
Uefa: Denmark (21), Italy (12), Poland (36).
Concacaf: Honduras (65), Jamaica (71), Suriname (125).
Conmebol: Bolivia (77), Venezuela (49).
OFC: New Caledonia (151).
Africa: Burkina Faso (62), Cameroon (44), Gabon (86), Nigeria (26).
Six of those teams are from the top 50 of Fifa’s world rankings – three from Europe, two from Africa and one from South America.
And therein lies the problem. Asia and Concacaf are weaker confederations, as was proven by performances this year.
Nine of Africa’s 10 countries got out of the group stage. But only two of nine Asian countries advanced, and just three of the six Concacaf countries – the co-hosts – made it through.
New Zealand, who got one point and finished bottom of their group, are the only country from Oceania in the world’s top 150.
There is an argument that if you extend again, you should give a greater weight of places to Europe just for competitive balance.
But, on the other hand, there are those who would argue that bringing more teams into the World Cup ultimately allows the game to develop further in those countries.
Infantino will sell the expansion as being good for the global game, but there have to be doubts that it is good for the competition.
Almost a third of Fifa’s 211 nations would be present.
Would the group stage not simply become a glorified pan-confederation qualifying competition for what is, essentially, a knockout tournament?