The author implies the assumption that over time, distributed data will get quicker and cheaper, like the CPU and memory on a PC. It won't. It can't. The pro

The author implies the assumption that over time, distributed data will get quicker and cheaper, like the CPU and memory on a PC. It won't. It can't. The problem is that validating transactions on a blockchain must be expensive. If they were cheap, then I could spend a few bucks, take over a blockchain, and say that my transactions are the valid ones. There's no way around this issue.