Well it seems logical that Bitcoin was created by a team of people, and that they used a pseudonym or a figure head to launch the project. Banking is really controlled by the wealthy dynasties, and they needed to experiment with various alternatives to replace the dying fiat currencies. Bitcoin would appear to be one of the more successful of these. The 21 million cap, and the average 10 minute block generation time mean that it can never become a general currency for everyday transactions. The 21 million cap also means that the bankers can control Bitcoin by purchasing large numbers of coins, and this has the added benefit of further increasing their wealth.
Bitcoin is no longer "ours", but we can use it to our advantage, provided that we work with the financial institutions and governments that are now using it as a store of wealth. We need to use the changes to our advantage, and not try to fight the massive sums of money that are flooding into the Bitcoin economy.
Yes, it might be that the team actually included bankers. However, it doesn't mean they weren't Satoshi because we don't know who Satoshi is. And, to be honest, even though it can be argued that Bitcoin could be created by banks, I don't think this is truly the case. After all, it appeared as an alternative, and it appeared when banks failed spectacularly, causing the global economic crisis by their games and getting bailouts anyway. And a part of Bitcoin is ours if we own and use it. I don't believe Bitcoin is controlled by any corporation or a conglomerate of them. I think it might be occasionally manipulated (the price), but without a long-term effect. Bitcoin is ours.