even if bitfinex returns as a "better" exchange, people will do everything to avoid it. no one serious will keep using an exchange runned by incompetent rookies. traders will move to bitstamp or kraken.
Sadly I don't think this is the case. People are too addicted to margin trading and liquidity. Greed rules all even when it's interspersed with being raped as well. I hope they dwindle to nothing but I'm not holding my breath.
What's wrong with margin trading and liquidity ? You can't buy your everyday groceries with bitcoins,can you ?I don't think its the result of greed as you put it.Even if it is,a website's architecture should be strong enough to resist such attacks since people's are putting their damn savings in there.It's fault on their site,I don't think you should even open that website ever again.