Not sure but he touched on something that might have struck a nerve. The ONLY people who could do something about FIFA were the sponsors. Threaten to cut down the money tree and change will come faster than you think.
Offhand, the only other agency that might have sufficient weight to move things behind the scenes was UEFA. They have the teams, the money and most of the relevant fans. If they move in sync with Brazil and Argentina, FIFA runs out of relevant matches.
I'm sure sponsor pressure had a lot to do with it. You can sell "It's just the Americans" about the DOJ investigations to a lot of your voters, but when the money goes away you don't have the means of control.
He appealed to FIFA advertisers to help him go away