[superuser2]

Lending and credit are fundamentally, irreconcilably opposite to anonymity. It doesn't make sense to talk about taking out a loan in a decentralized/anonymous cryptocurrency system.

A reputation system (credit reports/scores) only works because each human who borrows money can have at most one identity. In an anonymous/pseudonymous system that cryptocurrency advocates want, I could take out a loan, spend it, and then take out another loan with a new pseudonym (or Bitcoin address) minutes later.

There is no threat of inability to get credit in the future. Even if you had agents willing to commit violence to coerce people to pay their loans (or, if we're in civilization, a state that will do asset seizures and wage garnishment with some semblance of due process) you wouldn't know who in the real world to point them at. Why would anyone lend Bitcoin?

If you were going to do that, you would need to verify government-based identity and use government to recover your money from deadbeats. In which case, why are you using Bitcoin anyway? At that point you could just lend the local fiat currency so your debtors could use it to buy Bitcoin (or whatever else they wanted.)