Bad news for those who buy on an exchange as their coins will start to leave a trace.
I have even considered once to ask if the exchanges I am verified at offer the possibility to delete my account with all my personal information. I can't seem to find anything in their TOS, so I have to email them for real in the coming days to ask what the options are. I am actually worried, because an exchange can easily be forced to hand over user information with all trading and deposit/withdrawal logs.
Once you have verified yourself I'm pretty sure there will always be some trace of your personal information, regardless if you ask them to 'delete' it. There will always be that one backup server that still has your private information on, and if the price starts ramping up again and the IRS starts smelling money things could potentially go down. They can (and probably) will force a lot of exchanges to hand over personal information and then they will start their witch hunt. Of course that would be the worst case scenario but that doesn't make it less probable.