Broken fungibility could destroy Bitcoin, as Bitcoin would not longer have just one price.
Adam admitted that Bitcoin's fungibility model is fundamentally flawed and broken!
... and the virgin anonymous coin is intrinsically worth more (even if sells for same price) than a coin obtained via an exchange.
mtgox 1btc = $360
coinbase 1btc = $650
Spread is now ~45%. Those assholes at mtgox have a license to print money: buy their own cheap btc from panic sellers, don't allow anyone else to transfer out but themselves, sell on another exchange like coinbase for an instant 100% gain, rinse, and repeat. Maybe that's the plan all along, criminals...