ill give you two countries that should have AAA rating,
China and australia,
both economies are in a boom phase, australia has a massive amount of coal export to china which has kept our economy strong and us flush with cash, our debt is tiny and we export a insane amout of resources, check the next time you buy lamb, almost garenteed its aussie lamb,
aslong as countries burn coal as a power source australia will be able to have a AAA rating.
oh plus we have a bombing tech market, car manufacturing industry, cotten industry and wheat industry, we have enough industry that if one falls the others prop us up.
Yay australia!