[yumaikas]

> If you could rely on blockchains instead of trusting based on past cooperation

What about blockchains would make them an effective stand-in for building trust over time? One is a ledger, the other is an interpersonal relationship, and the two really are not the same.

If I'm going to take a risk, I'd rather take a risk where there's some human expectation of managing bumps in the road, and which has some means of redress if sufficient malice is involved, instead of one where a smart contract bug means that I've lost a lot of money.