For now I don't see a Bitcoin Credit Union as a possible thing even if it's totally non-anonymous.
If you lend me say 1k BTC and you live in US while I live in Romania...You can have my e-mail, my skype, my real address, my cc number but nothing would make me pay if I don't want to.
I've seen "reputable" people doing all sort of things to skip a simple restaurant bill, imagine what would be the choice of one of these guys if he had to choose between buying something real for his familly or paying a guy 2 continents alway who can be totally ignored with a few clicks of a mouse.
That's probably the main issue a BTC CU would face. But what about if we had more of an 'association' of credit unions. Maybe one in the EU, one in North America, one in South America, etc. Would that provide a legal way to mitigate the risks? If it were anonymous, I would think not unless there was some way to maintain anonymity while still providing SOME traceability, that could work, couldn't it?
Anthony