While I typically advice people to avoid using off the chain solutions and centralized bitcoin banks, it isn't fair to compare Mtgox to Coinbase and circle. There is a world of difference between the two... and it isn't irresponsible for new users to temporarily use these services while they learn about bitcoin. You have to weigh risks , and a new user has far more risk at losing their btc with a personal mistake, technical problem or virus than the risks inherent with a regulated and insured institution where their largest risk is capital gains
New users should just be made aware of the tradeoffs.
I hear what you're saying, but in a way they are like Gox, except more professional and honest. If you don't hold the private keys, you don't own Bitcoin. Bitshares is partnering in a decentralized exchange, so it is possible. I just would like to see some with anywhere close to the volume of Stamp or BFX.
Ideally we want an ecosystem so robust that fiat isn't the main onramp, but rather businesses trading goods and services for coin. There is no way to do that however without a meaningful fix to the scaling problem that doesn't involve third party middlemen. If we need middlemen, then there is no point to this whole experiment. It is a failure.
Don't worry about my short. I have posted extra margin, so you can't blow it up without making me a lot more on my cold storage stash.