Its gonna take quite a bit more than them to do anything. The IRS dealt the death blow.
Bitcoin will continue to develop as a global currency until its useage as a currency can no longer be ignored by the IRS.
If it is considered a global "currency" than taxation of profits exchanging in and out will be handled like exchanges in and out of any other "currency" (which as an aside is actually less favorable).
I don't understand that point? You want it to be a recognized "currency"...but not one subject to all the other properties of other currencies world-wide when exchanged from one to the other?