I say goodluck to any government who thinks it is easy to seize a Bitcoin wallet. Maybe people should start using brainwallets so that they can always access their funds even if a government thinks they "seized" the wallet. You still can't kill it, there will still be people who use it, it will just be pushed underground. Even if a government will punish someone by death if they use i, there will still be people who use it, just as there are people who will kill others even though it can be a offense punishable by death in many places.