That's completely idiotic. Sony wants PS2s to fail so consumers have to buy new ones? That would make a lot of sense if you lacked the ability to reason. First, Sony does not even clear that much on each sale of the PS2, it's not even worth it when you consider the tradeoffs.
Tradeoff 1 - Customers have to replace a PS2, at the expense of possibly purchasing up to three new games (or even more bargains like Greatest Hits). What are the royalties for those games? Would those royalties match or exceed the margin on a new PS2?
Tradeoff 2 - What if these customers do not buy a replacement system? What are the values of the lost software sales?
Tradeoff 3 - It just goes against all common sense. It only goes to create customer ill-will, and that is something that no company really wants. A company is certainly not going to try to create a situation that would piss off the consumer.