There is a clear danger that the US, Europe, China, Japan and others will get togheter and flat out ban and even criminalize the usage and holding of Bitcoin. Resulting in after the ban, if you are cought using and holding BTC, you would get a huge fine or jail term.
I have been hearing this since a long time. What is the source of your assumption that these countries will ban BTC?
There is no news that support your assumption. On the other hand some governments are planning to regulate cryptos.