And then what, do I need to sue every time someone stiffs me? That would be a colossal waste of time and money, which means in practice that the fraud gets away with it – knowing they might not even have the funds to pay me.
The way it works now is, if I’m not satisfied and the merchant isn’t being reasonable, I can call my credit card company and request a chargeback. No lawyers and courts needed.
About chargebacks, again, it's a US and Australia-only thing, so yeah, maybe in those places Bitcoin won't look so good, won't be adopted, and they will be left behind.
Fraud is very different from chargebacks - if you lose money in fraud, good luck getting it back from the fraudster; proper chargebacks mean you get the money back in any case, even in extreme cases if your bank goes bankrupt during that time.
Fraud is still fraud, so if you get defrauded by someone, all you need is that a judge decides that Bitcoin is money, like it has already happened with that guy in the US who ran a ponzi scheme based on Bitcoin and got caught. So don't worry about that.