Pretty much this.  Although there are limits to my optimism when it comes to human greed and laziness.  No matter how bad exchanges get, I'm sure some determined idiots will continue to put themselves at risk by relinquishing ownership of their BTC.  People seem to have little to no concept that "deposit" means "hand over to a total stranger and you may never see it again".  I wonder how many people would still do it if it was worded in such a way.