Two new studies show great financial benefit from holding the World Cup every 2 years, estimated at €3.9 billion in the first four year cycle. That would be distributed among all 211 FIFA members. However UEFA countered with their own study showing a negative outlook for their confederation, showing a loss of between €2.5 and €3 billion over the same time period due to the required change in calendar. The disparity is likely down to confirmation bias with the studies showing the results that the commissioner wants, and the truth lies somewhere in between (see the ESPN article for more on this.