Yes to my well able hero comment,but at least ,most countries international sports are sponsored by their government's,so them getting to know about Crypto currency, can make them create their own digital currency,and possibly legalized Crypto,being it,its the only or a major means of participation
my point was that it can not be the "key to mass adoption" as your title suggests.
additionally i don't think countries creating their own cryptocurrency is going to change much about adoption of a decentralized currency like bitcoin or even legalization of it. it can go both ways. they can create their own coin while letting bitcoin grow or they can ban bitcoin while advertising their own coin as the only cryptocurrency people are allowed to use.