This isn't about linux. It never was. This is about getting what you paid for, and keeping it.
Let's say you bought a fairly expensive item - like a car. Let's also, for the sake of simplicity, say you paid for it in full. You are the owner of the car.
Included in the price you paid, there are a bunch of features - some you'll use, others you won't. Regardless of whether you use them, you paid for them. Moonroof, heated seats, air conditioning, etc...
Let's say one of those features is free maintenance every 6 months, at the manufacturer's dealership. You bring in the car, and they change the oil, fill the fluids, check the air in your tires, replace the windshield wipers, etc...
Now, a year after you bought the car, you bring it in for service. When you get it back, the heated seats have been replaced with physically-identical un-heated seats.
This may not upset you too much if you never actually used the heated seats. However, was it right for the manufacturer to remove them?
The next time you bring it in for maintenance, you ask what they plan to do. In addition to the usual stuff, they tell you they intend to remove your air conditioner - not because there's a problem with it, but because the manufacturer has decided they don't want to support air conditioners anymore. You protest - you paid for the air conditioner, and it's something you use. You don't want to lose it. The dealership says "OK, take the car and leave then. We're not working on it unless you let us remove the air conditioner. Oh, and you won't be able to play any new CDs in your CD player until you let us remove the AC."
This is what Sony's already done. This is what folks are complaining about - and what they have a right and duty to complain about.
What Sony's doing now is equivalent to the dealership saying: "We can come in the middle of the night and remove your AC if we so choose, without telling you or giving you the right to refuse".
Who owns that car again?
Who owns your PS3?