The ferry from Argentina to Uruguay everyday full of people taking money out of the country to deposit it in banks that won't be skimmed by the government is much more disruptive than a handful of bitcoin traders.

Bitcoin however is great for avoiding the official fake exchange rate and getting the real rate, which is often 2x the amount of the official rate. If you're travelling to BA you want to avoid those sketchy blackmarket moneychangers floating around. If you're a tourist there's good odds you'll be receiving counterfeit Argentinian Pesos or end up getting jacked by a guy on a motorbike after he watches you exchanging money in the streets whereas with Bitcoin you can safely meet somebody in a coffee shop, do the trade and they usually have some kind of localbitcoins.com or other online reputation they want to keep so won't be handing over counterfeits.

Bitcoin hasn't replaced the mass exodus of Argentinians who deposit money outside the country in Uruguay yet. http://en.mercopress.com/2013/03/05/an-estimated-one-million...