You attach too much importance to CC chargeback mechanisms. I am a typical American consumer and in 20 years doing about 5,000 credit card transactions I have never had to issue a single chargeback at all. So I know for a fact that I would be willing to use Bitcoin for all its advantages if that meant giving up the ability to charge back. Consider this: credit card fees which are passed to customers by inflating prices by ~2% probably indirectly cost me north of $20,000 over my 20 years of use. I could have saved $20,000 and I would have been totally fine with the lack of chargeback mechanisms in Bitcoin. Even if I end up being scammed one day by a non-reversible $1000 Bitcoin transaction, I would still be $19,000 financially ahead with Bitcoin.

Also, CC chargebacks are far from being perfect. In many cases the customer has no recourse for fraud. For example you cannot chargeback a transaction made more than 60 days ago. Some fraudulent merchants stall shipping (eg. claim delays, issues, ship the wrong thing, etc) for 60 days specifically to exploit this fact and exploit the fact customers don't know about this 60-day chargeback limit. Or if your PIN code is stolen and a fraudulent transaction is made with the PIN code, you will typically be held liable (check your CC fine print, for example: "If your Password or PIN is used in such a transaction, you will be liable for the full debt" from http://www.scotiabank.com/ca/common/pdf/borrowing/revolving_...)

Don't forget that despite the lack of chargebacks, you still have all the other usual recourses available to you if you are defrauded after paying in bitcoins: small court claims, send a complaint to the FTC or BBB, etc. But the fact chargeback mechanisms are rarely needed in the first place, and have various limitations (60-day, PIN stolen, etc) indicates that Bitcoin doesn't need them to be reasonably successful as a payment technology.