You seem to believe that in the face of an attack Bitcoin will not adapt, that is a fatal error. There are many methods of reaching consensus available in the toolbox and the number is only growing. Proof of work failing does not equal Bitcoin failing, you might be a bit confused about this point.
---Responding here due to rate limit...
Variations of POW, POS, POK, etc....are easy drop in replacements that are actively being developed as we speak. Most of those alts you speak of have Bitcoin DNA at their core.
>And even if it does, nothing prevents me from 51% attacking that one, too.
Good luck attacking Bitcoin with a proof of stake hybrid that requires owning 51% of the supply to succeed, when the majority of the supply is already issued and is not available for sale. That's why I keep stating that a 51% attack/defeating POW is just the beginning of the work the Fed has to do...
---Rate limit response part 2....
>Finally, this is all kind of irrelevant to the article.
I think you are admitting defeat in long form. The article itself is irrelevant because it doesn't consider the 2nd order effect of any attack. Bitcoin is considered anti-fragile for a reason, it gets stronger as it gets attacked. The developer communities (including the devs working on alts) are an inextricable part of its anti-fragility.
>not some imaginary future thing we might or might not be able to invent after the Fed 51%s actual bitcoin to oblivion.
I could hit a target where it was positioned x years ago... Big Whoop. You aren't defeating its current form, so you lose, repeatedly, and debase the currency (USD) further in the process.
After a few trillion dollar USD expended on failed attacks, the currency being issued will be debased enough to be noticeable by consumers. This "infinite money printer" argument is not thought through. The outcome of more debasement is more demand for bitcoin aka undebaseable money.
Bitcoiners know there is a hyper inflationary event coming soon, I'm sure many would love to induce it by getting the fed to burn money attacking bitcoin :D