[nikcub]

You would replace a bank with coinbase, circle, someone else you trust or 2, 3, 4, 5 or even 10 other companies or individuals. Similar to a web of trust.

That is just to replace the trust element of a bank, not the financial function. At the moment it is nearly impossible to split trust across more than one institution - which means there is a single point of failure in the trust chain and if 2008 repeats again x% of people will lose funds. m-of-n allows you to distribute that trust, even if its just more banks signing the transactions to begin with.

Further, there are other ways to do proof of reserve with bitcoin that don't involve m-of-n.

In terms of the financing and risk assessment element, you could carve that out in tranches and sell out it on auction. At the moment the $2 trillion p.a trade finance market is limited in entry to only those who have a banking license, hence the thick fees and profits in it. You could open up the financing and terms to an open market, just like crowdsourced venture funding or project funding, or have smaller institutions that specialize in certain types of risk that they better understand (it is crazy that there are a half-dozen major banks who pretend to be able to understand and price every time of import / export finance situation anywhere in the world).