So, what is going on?
The idea was first “spontaneously raised” at a Fifa council meeting in March by Uruguayan Football Federation president Ignacio Alonso.
It was then presented at Fifa congress in April by Conmebol, which believes it would be a fitting way to mark the World Cup’s centenary.
Fifa’s official position has always been it will discuss expansion ideas with its stakeholders and it is duty bound to consider any proposals from its council members.
The Fifa council would make the ultimate decision, but there are no signs it is something expected to be made imminently.
How dramatic would this expansion actually be?
Fairly seismic is the obvious answer.
The pace of change has been remarkable, since the long-standing 16-team format increased to 24 teams in 1982.
It became a 32-team event in 1998 before being expanded to 48 teams for next summer’s showpiece.
Adding another 16 teams for 2030 would mean the World Cup had doubled in size in eight years and would mean more than 30% of Fifa’s current 211 members would participate.