Confiscation is impossible (by design). Banning would be possible in countries which have Laws that disallow Barter systems (but I don't know any). Further we can prove in the Ledger, that only 5% of the total Bitcoin-economy is used for black market transactions, which is extremely tiny compared to the USD market, so play no role at all (and FinCEN acknowledged that in the hearings).
For the ignorant bystander, who doesn't have any idea how useful it is, it all looks like the Internet in 1995 (only for geeks, and porno, and to whom should I ever sent an email??).
Luckily the number of open minded people, who take some time to analyze Bitcoin's properties, grows each day exponentially.
I just read this, from a Stanford professor, who was skeptical until she studied it some more:
http://www.coindesk.com/professor-susan-athey-people-use-bitcoin-intrinsic-value/