If global adoption is to be achieved, bitcoin must be legal everywhere
That's not true mate, half of the world would be enough - it would have the same impact.
Let me clarify, big business and global adoption is what will make Bitcoin more valuable than anything we have seen in the past. If it is associated with illegal activities with things like DSV, then I can assure you no business will want to build something on top of bitcoin, and no country will use it as their currency.