This is just another reminder to not trust exchanges with your money and to not use them any more than necessary.
How will you buy and sell Bitcoins if there are no exchanges ??
You misread that post and it says don't use them anymore than your basic need. Don't leave funds on an exchange, not even for a day because that could be the one day they go down. This happened with me on Bitgrail and I gotta say it sucks to lose a lot of money that way.