• global always-on connectivity
• encryption constructs
• easy discovery/formation of communities-of-interest
• open source collaboration
• instant rich search and giant archives of past behavior
• delegation of policy to ever-improving software/automation
• cheap powerful handheld computer-phones
• ...etc
These may not seem to be similarly novel breakthroughs; we're getting used to them, over the last 5-20 years. But now they're being applied to a monetary domain, via Bitcoin (and other cryptocurrencies), where progress was formerly bottlenecked.
So while I'm wouldn't generally put a lot of weight on the cheap, shallow shot against Krugman – "he thought the net wouldn't have more impact than the fax machine" – there is a somewhat similar failing here. By looking at one aspect of Bitcoin in reductionist isolation, he (and his tech friend) are missing the combinatorial effect of all these new possibilities together.