Actually, you lose none of your money. The credit card company completely refunds you. Someone once stole my card and got some gas with it, and the next day I got the transaction refunded and a new card issued within 10 minutes.
Bitcoin is far less secure than a credit card. The best way to lose thousands of dollars is to invest it into bitcoin and then trust any webservice to hold onto your coins for you. It's what happened to me. If I had experienced credit card fraud instead of bitcoin fraud, I'd still have my money. Now I don't.
What you're describing is security for a merchant. Preventing chargebacks sounds great... for merchants. But security for consumers is obviously more important, because consumer adoption is the single most important factor.