Actually, I don't think you're far off the mark. If I were either the US government or the banking system, I'd have to be an idiot not to buy as many BTC as possible... You have to figure the Chinese are thinking about it, with a currency that is as ridiculously devalued as theirs, and dependent as they are on the strength of the US dollar to purchase their goods, a comparatively small investment would get them enough btc to, down the road, try and regulate the price.
Also, bitcoin poses an immense risk to the US dollar. Shutting down the system isn't going to work. Going out en force and buying thousands of BTC, even as the rate continues to rise, would give them some control in the future.
Then again, all of this requires intelligence and a certain philosophical outlook that may not be that prevalent among Washington insiders and the banking elite... But I'm guessing there are at least some brights among them who are raising an eyebrow and wondering if it doesn't make sense to buy.
Or... They will declare a "war on bitcoin", which has about as much chance of success as the war on drugs, on porn, on music downloads, and so on.
Just my .02 UTC (micro BTC?)