Earlier quoted context omitted.
For a different perspective, I would say their problem is integration with the "real world" with constrains that bitcoin wasn't designed for.
What use is a currency (or commodity!) that you can't convert into a good or service? It seems like a fundamental problem if the theoretical advantages of a currency are lost the instant you try to use it to buy something. Otherwise we're just wasting gigawatts of electricity to print Monopoly money.
The sooner people realize this is exactly what is happening, the better.