This is a serious discussion. I mean, after I've seen how bitcoin (and other cryptos as well) got dumped badly after an irrelevant law that makes ICOs illegal. I can only imagine now what would happen If more countries do the same thing and It could get worst by make itself bitcoin illegal.
They say there is strength in numbers and if this is the route most countries choose then they are half way their but bitcoin is a new technology that is opening the world to new opportunities and its, for this reason, it should be adopted and not banned
Whether we like to admit it or not, most of people would sell everything they have once its made illegal, some may continue to fight the central banking but the sad reality is that as soon as people start making profits, they will dump it and move on.
In as much as this sounds scary, its the honest truth and banning bitcoin would prevent other blockchain startups from taking off as they would avoid going the same path as bitcoin.