Per IRS, bitcoin is taxed as a property. The SEC seems to view the legal status of bitcoin and related crypto instruments as a commodity. If you have a non legal tender with no asset-backed security (ABS) whose income payments and hence value are derived from and no collateralized by a specified pool of underlying assets except a distributed ledger, its going to have a greater statistical measure of the dispersion. I personally do hope it crashes and burns, and will for the first time in my life buying GLD in reaction to short weakness in bitcoin, in the last 30 days bitcoin is up 3000$, but i always see the glass half empty and am not winning until other people glasses are empty and insolvent.
The US Treasury does not have the power to declared them illegal, you are a moron for asking that question, when they have already has declared him as property. The IRS has told Congress that it will issue new cryptocurrency tax guidance soon. In a new letter, the IRS Commissioner said he has “made it a priority” to issue additional guidance on crypto taxation.