Honestly, I don't think that some countries would like the idea of bitcoin... They'll ban it in my opinion due to the danger of terrorism funds transfer anonymously as soon as they come to know more about bitcoin.
In some countries yes, and probably bitcoin would remain in online transactions, even if some countries ban them.. there would still be new users of it just like this days...
Most countries likely will not ban Bitcoin unless it becomes a giant entity threatening to disrupt the status quo like it did when it broke $1,000. That got Bitcoin onto most people's radar.
If it never reaches big numbers again, expect it to never really show up on any country's radar.