When Bitcoin becomes illegal, its price will be close to 0 and the future price should follow in theory.
Any moment, I tell you, any moment it's going to happen, Bitcoin will be banned, you'll see, just wait, it's going to happen, the big day is coming, hold on, give it time, and so on and so on.
As far as banning goes. Who bans it? Everyone country at the same time or just one or two here and there? If just a few ban it, and it continues to work as planned, won't the other countries be at an advantage? Quite possibly...
As a very wise man once said, you have two choices with Bitcoin -
1. Start to understand it, or
2. Dismiss it
Choose wisely.
As far as those choosing point 2, time hasn't been kind to them over the last 12 years and counting...