I believe it's going to have a drastic impact on the people who use them. But first let's talk about government taking initiative to ban it. They'd ban anything they see as a threat to them.
If BTC has a huge growth in value that is, as far as the world goes, i doubt it will have some sort of a big impact to the economy, probably make the other currencies grow even more..
Like Russian ban bitcoin from their region, and it gives a lot of impact for bitcoin users in the Russian, Many merchants,store and big seller like steam feel the impact of this.
Oh yeah, that's a very bad impact on the economy as well, well not for the russian economy, but for the people and for the economy if we look at it as a whole, it has a drastic impact to the BTC currency price.
Russian oligarchs see it as a threat to them, though I believe still that a lot of russians have found a way to use it, vpn etc, probably still keeping it stored in their wallet for usage later or maybe exchanged it already.