I dont think that majority of the countries will ban bitcoin, there were only few countries who have done this. Government are now starting to recognized the use of bitcoin as a form of payment and asset. Bitcoin will only be ban once it become a threat to government, this would become threat once people use it on illegal activities.
The only risk with your wealth is once people stop from using bitcoin. But that would be impossible, instead the opposite happens. The continuously rising and demand increase while supply in limited. I assume that you have big amount of bitcoin for now since you have been saving since 2013. Just avoid lossing your password and suddenly got hacked. That would be the worst thing to happen.