As Bitcoin is limited in number, I believe that countries which will have the most amount of Bitcoins once it gets completely mined, are going to reap the most better profits.
It depends on the usage though, and what exactly you mean with countries having the most amount of Bitcoins. If countries start controlling large numbers of coins, they have all the incentive they need in order to at least attempt to steer development in their preferred direction, which isn't really that much of a good outlook.
As far as the usage goes, we really need Bitcoin to function as currency, because the store of value aspect will stagnate eventually just like what happened with Gold. You can't endlessly keep banking on something that doesn't provide any real world utility. Bitcoin is the one that picks up where Gold stopped being what people thought it is/was, a currency.
The most important aspect to focus on is how Bitcoin will scale towards mass use, because as long as that isn't the case, there isn't much other than hopes and dreams to think about.
Personally, I cant see the effects that crypto has on the economy of a country. I agree that it has an impact but I dont think it contributes to a countrys GDP. But with what 1Referee has said, its true that bitcoin should eventually be given a real world utility otherwise it may eventually lose its luster. I believe that bitcoin is still on the path towards becoming a currency, and many other cryptos may have the same potential. Adoption of the use of crypto as a currency have been underwent in other countries so its a good sign that theres still some effort being made to utilize crypto as a currency. As technology advances, its quite possible to be see the expansion of bitcoins function as a currency in the foreseeable future.