If you had asked me a couple years ago if the US government would try to "ban" bitcoin I would have said the odds were good. Nowadays though I don't see it happening. The growing trend is that the US government is fine with bitcoin and they see the benefits it offers to business, consumers, and the economy.
I agree.
Consider this: would the US government (FBI) auction BTC to US citizens, then "ban" it?
That would be a pretty unpopular decision, I don't see it happening. Therefore, I see the FBI auction as a hugely positive indicator of US official sentiment.
I just postet the same consideration here https://bitcointalk.org/index.php?topic=397534.20