Pointing out imperfections in credit card insurance doesn't mean bitcoin will work. I'm sorry but even you have to realize this is not even a logical point you're making.
Again, you completely missed the purpose of insurance. If your bitcoin hardware wallet is stolen, does it have insurance? Was any of the 4 exchanges hacked last week or Mt. Gox insured as your bank and payment processors are? Mt. Gox was not a ponzi scheme because it is not an investor - stop comparing it to one.
>Why do you present 2.7 transactions a second as being a sort of fatal flaw?
Because it is?
Block size can't be increased because bitcoin is decentralized. Each miner, merchant, etc. are rational actors looking out for their own profit, and can't come to the required consensus on any changes (hence how centralized agnostic monetary controls work). It's one of the reasons other cryptocurrencies, with higher xfer rates, have a competitive edge on bitcoin.
Bitcoin can not support more than a couple million users. Is this really news to you? Full disclaimer please: How much have you invested into bitcoin?