I disagree, bitcoin can certainly be regulated. You just watch.
As far as OP goes, when I sell something on Ebay I have immediate access to my money. So that must vary among countries, and I'm sure if a bank or whatever decided to start using bitcoin as a currency, its use could be regulated just like this. At least that's how I imagine it--and I'm not an economist or politician, so take my opinion for exactly how much you paid for it.
The government sure can "regulate" it. But regulation and control are two different animals. They can say "you cannot do this or that" but all they are doing is pushing it to the underground. The more they push it there the more will it be harder to regulate. The black market would welcome this with open arms. So the government better study it thoroughly before those clueless politicians make laws to "regulate" bitcoin.