I don't think countries like Russia will allow Bitcoin to be used as a legal currency in the near future - because it's not just about paying for goods and services, but also funding various opposition movements that would certainly strengthen and pose a threat to those in power. Even if by some miracle such a law is passed, it can also be withdrawn very easily - so one should not be too optimistic when it comes to such news.
and in a country which as mentioned governed essentially by one man, Bitcoin reduces his
control over the countries finances. So any news from Russia should be taken with a pinch of salt.
Apart from the Russian Ruble, I don't think that any other currency would be granted the status of legal tender anytime soon. Because RUR is under heavy pressure and during the last 7 years, it has lost more than 60% of its value. If BTC is allowed for payments, then people will prefer it to RUR, and it will further weaken the national currency. But as far as I am concerned, that step is not needed for now. Russian citizens are allowed to make investments with cryptocurrency and the tax rates are extremely low. For me, that makes Russia one of the most pro-Bitcoin countries in the world.
i would imagine when Bitcoin gets too big the liberties which Russians are
enjoying now will be revoked with restrictions in banking or something like that.