It sure could be but I doubt any real rise will come of it. Maybe some people will use cryptos but I doubt it will cause a huge flair in crypto usage. I think the Olympics would be a better suited venue to increase awareness.
The world cup is far bigger than the Olympics, so why do you prefer that event to the world cup? Lets consider the country that will host it too, is crypto accepted in that country? I agree with you that the change may not be significant, but if there should be an event that will bring a change, then it should be the world cup.