George Claw M.D. said:
Let's think of it another way, and assume this is easily doable, and hackers can spoof legitimate console ids and match them up with the correct mac addresses, with 100% success. In that case, I'd think Sony would just stop banning consoles, with no reliable way to distinguish hackers from legitimate users. Why ban consoles, if hackers can easily unban themselves, while unintentional banning of legitimate users will just lead to customer support headaches and possible lawsuits? Of course, PSN will be run amok with hackers and cheaters, but that's the consequence.