We cannot do anything if governments decide that they will ban bitcoins. But as long as they are not making any moves in banning bitcoin. I think we can do all we need to do to earn good amount of money in bitcoin.
But we can go to some country that doesn't ban bitcoin if we want to continue our journey about bitcoin. Some country doesn't and less chance that bitcoin would be ban on their country like japan because they are very strong and support bitcoin because they believe on it.
The governments can ban it but it is too impossible that all country do ban bitcoins.