They can't win because they know BitCoin is a God-send. The time was right and the technology is ready for a 'hard' digital currency, hard in the same sense as gold or paper bills (e.g. USD, EUR, GBP...).
Let's just pray that BitCoin's creators tested the crap out of it before letting it loose on us such that no cracks are showing in the heuristic driving BitCoin. That is what worries me more - cracks in the algorithm that can be broken by cryptoanalysts - although the way it is designed, it's a form of Aikido against the government, in the sense that it uses SHA-256 which is gov't endorsed

.... It thrives on true and tested technology, which is awesome.
I promise you, if Bitcoin's legitimate use spreads across the world like wildfire - which it undoubtedly will as most people aren't LSD junkies, spouse-cheaters or criminals - it has the potential of replacing all world currencies and uniting the world. Yeah, I may be a dreamer... but you just watch.
For legitimate uses, it CANNOT be shut down - just remember that. BitCoin, in and of itself is not ILLEGAL, just as money in and of itself is not illegal - it is the desire of a person to use it toward a particular fitness or a purpose that will render the act of using it as illegal or legal.
BitCoin = the light of the world.
HAHAHA they can't win, this is so amazing!