If this is the case then there is always money like that seized and bitcoin price will be like hell.
I saw in my country that some politician thinking to invest their black money on Bitcoin.
Most of us, who have been paying attention, should all realize by now, that the USA government is one of the biggest bullies on the block when it comes to a lot of its behavior in connection with the seizures of property and money and the exploitation of individuals, companies and/or countries by the use of various seizure related tools.
Additionally, in the bitcoin space (and its fairly brief history) we have already witnessed similar kinds of USA govt seizures regarding bitcoin - especially regarding the DPR coins (both customer coins and those coins alleged to be DPR's).
Further, I am NOT sure yet whether there is enough evidence to exonerate the USA government in being involved in the downfall of GOX (and may potentially be involved in one way or another with some of the missing 650k BTC associated with that situation).
In other words, Bitcoin does NOT seem to completely circumvent the USA government from seizing bitcoin or bitcoin related assets, even though there may be greater obstacles in which the USA government has to overcome in order to find and/or to get control of BTC specific assets.
I would NOT be surprised if the USA government were already extensively involved in various aspects of BTC mining - and actually I would be surprised if the USA government had NOT considered this angle of BTC and were NOT yet involved in BTC mining in various ways.