"At the end of every seven years you must cancel debts. This is how it is to be done: Every creditor shall cancel the loan he has made to his fellow Israelite. He shall not require payment from his fellow Israelite or brother, because the LORD's time for canceling debts has been proclaimed."
(http://www.biblestudytools.com/deuteronomy/passage.aspx?q=de...)
It's interesting to imagine a world where there was no legal recourse to someone not paying back debt: easy to imagine some first-order consequences, harder to see how it'd change the grand scheme of things. I suspect it would end up being a much better world, but I come from a very anti-debt perspective.
I think it sounds scary. If I enter into a contract that says I have to do something in exchange for something else, I'd like a court to honor that contract, and not -- somewhat arbitrarily I'd say -- declare debts in the contract invalid after seven years.
Imagine no one being able to issue debt with a maturity of more than 7 years. That would be the consequence of such an interference into the market. This means our economy as a whole would become even more sensitive to interest rate volatility, as you can't secure the interest on a loan for more than 7 years at a time.
I'm not saying that having a bunch of debt is good. But imagine where you'd be right now if you couldn't get a student loan for an education. Or finance a car or a house. I'm pretty sure I would not be where I am now if I hadn't gone to school... which I would not have been able to do without a student loan. And I never would have been able to get a house without a loan.
I think it's also easy to overstate how much loaning would decrease. The widespread use of credit scores when issuing loans belies the idea that it's only state violence that ensures people pay back debts.
Maybe it'd make sense in a totally anonymous world, but why not just do business with people or entities you can trust? Think web of trust. That's what consumers and businesses de facto do nowadays anyway.
You could still issue debt; it's just you can't expect to have violence to back it up. Past decisions and alignment of lender and borrower self-interest determine the likelihood of it being paid back.