>Bitcoin can be hampered but not outright killed, at least not over night. A death by a thousand cuts is the most likely solution but by no means guarantees Victory.
Ignoring policy attacks, and focusing on the purely technical:
A useful metric here is to compare the cost of executing a 51% attack on Bitcoin long enough to erode confidence in the software to the military budget of the top nation states.
Additionally, the broadly assumed consistency properties of Proof-of-Work cryptocurrencies fall apart in the face of a powerful network adversary who can cause arbitrary segmentation.
Everyone seems to forget that whilst a 51% attack could easily be financed by a nation state, actually getting the hardware to perform it is the bottleneck.
Ignoring policy attacks, and focusing on the purely technical:
A useful metric here is to compare the cost of executing a 51% attack on Bitcoin long enough to erode confidence in the software to the military budget of the top nation states.
Additionally, the broadly assumed consistency properties of Proof-of-Work cryptocurrencies fall apart in the face of a powerful network adversary who can cause arbitrary segmentation.