Well...being in my line of work ... It wont be long until sony will deal with people who have a hacked system. Yes everything that connects to the internet in some sort of manner has a mac address. Every mac address is unique so im sure it wont take long at all to identify them.
Microsoft's system is crap for security. Their engineer's couldn't find their way out of a box with the top open if they wanted to, more less secure the xbox. Sony has done a supurb job protecting their systems. I am still a believer that this will be squashed quite fast.