On BTC going to zero, on a very fundamental level, as much as we like cryptos we cannot disregard the possibility, if we do, we're bad traders. During the tulip mania people also thought their price would keep appreciating. It crashed pretty much down, not to zero, but to some cents...

Also, if bitcoin is to cryptos what the 386 was to computers, then can you imagine what the Pentium 4 of cryptos would do to Bitcoin? Be careful not to fall into the trap of permabull, which I think you are.

In terms of 1 nuke, true, the internet would survive, but if 1 nuke is released we'd surely not stop there. Do you really think that if US would nuke Russia or China that there wouldn't be a retalliation followed by global chaos? But read above in one of the comments, worse than a nuke, would be a NEMP, and that can take out the entire web indeed, in fact, the web would be one tiny fraction of what a NEMP would take out.

When people sit at the top complacency is killer, don't ever think for a moment we're above everyone else just because right now, this very moment, we're winning by being in cryptos. Change is fast approaching.