What did Citibank get out of it? It got the ability to reverse the arbitrage. Actually, what they got was the ability to give themselves a profit, and that saved the bank.
I think the market is always going to be around. The goal is not to say, let's get rid of the market, because the market does render a huge number of services, and I don't want to have a fight about the price of something every time I buy a book or a bottle of water.