I'm not sure that's how people think of it, if someone just came up to you and said that your desk is coming up on 5 years and you should replace it, or your car is nearing a decade and you should replace it "just because", I'd be pretty hesitant.
Also, this car/deck costs less than $100. Security holes aren't a "just because" thing.
Plus changing computers is probably cheaper than a new transmission after 10 years.