the funny thing is that nobody will ever do that. The moment someone uses quantum computing or any other technology to crack bitcoin in a visible way, the coins they just gave to themselves become worthless because confidence collapses.
In the 60's we actually had extremely capable, fully-developed computers. Advanced systems like the IBM System360 and CDC 6600.
Quantum computing is currently stuck somewhere in the 1800's, when a lot of the theory was still being worked out and few functional devices had even been constructed.
tbh they could just be pushing for people to adopt newer, less-tested, weaker algorithms. switch from something battle-hardened to the QuantResist2000 algorithm which they've figured out how to break with lattice reduction and a couple of GPUs like those minecraft guys did.
I will never get used to ECC meaning "Error Correcting Code" or "Elliptic Curve Cryptography." That said, this isn't unique to quantum expectations. Faster classical computers or better classical techniques could make various problems easier in the future.
The video is essentially an argument from the software side (ironically she thinks the hardware side is going pretty well). Even if the hardware wasn't so hard to build or scale, there are surprisingly few problems where quantum algorithms have turned out to be useful.