I don't think that releasing a new model that requires altogether new keys will be the best of solutions, after all the douchebags are a minority and it will end up screwing over the already existing base of legitimate players, one in ten thousand would be a rough approximation of those who are considering tampering with the console, so what are the others to do short of purchasing a new console?
yeah i seriously doubt an entire new model PS3 is the answer - and I also doubt they're considering that as a real solution.
perhaps it is something they can change in the firmware, maybe all new models will just have the fw loaded in it as opposed to having to download 3.8 or whatever it will be.
perhaps they'll consider a model that they're already using for games like SingStar where any songs downloaded to your PS3 are "locked" to that particular PS3 that was used to buy and d/l the songs. I had to phone up Sony UK to release the songs from my old YLOD PS3 so i could grab them again on my new slim. (not sure if the hack would even allow me to do that as security for the songs seems to be on their side of the PSN)
some form of PSN registration and system locking a copy of a game (unique number per disk - hard coded) is probably what they'll be looking at, but again probably only for the new games.
Proud Sony Rear Admiral