That line of thinking may very well end today, as it appears Sony has filed a patent for some sort of NFC (near-field communication) technology that will do just that. The patent was first spotted by NeoGAF user gofreak, but we still have yet to track down the official source of the patent itself. As such, we'll have to treat this as rumor for the time being.
The text from the alleged patent is filled with a whole bunch of technical babble, but the general gist of it is that in Sony's next console, games would communicate with the system via NFC, tethering the game to that specific machine, thereby preventing the resale of the software.
Naturally, this opens a whole new can of worms. What if the console breaks? Is this somehow tied to the user's PSN account? Does this mean the console needs to be online at all times?
We'll be sure to fill you in as soon as we know more, but don't expect Sony to confirm the validity of this report anytime soon.