I don't understand why you are obsessed with not calling it a currency. You haven't showed us any of the laws you claim would make a non-backed currency illegal, and bitcoins are being used as a currency, so I don't see any reason to not call it a currency.
So on what grounds will a Senator be able to shut it down?
I hope none.With legislation maybe like China did a few years ago with "Virtual Currency"? But can you do that to unique digital goods/commodity that has ownership and is transferable in a free market system?
It's certainly possible.Some might say its untraceable? - Only if you launder it - that's illegal - not if you trade/barter a digital good/commodity?
This is true.But seriously, what is the point of all of your questions? Are you trying to figure out whether bitcoins are legal? Or are you just arguing definitions for the sake of arguing definitions?