Oh sure... next thing you know, you'll be applying this logic to cell phones and realize you don't need a new one every two years, and then computers, and onward from there. Some time soon you'll start to think that you don't need every new idea they come up with to sell you on TV or via the mail.
I don't like where you're going with this. How do you expect the economy to continue to grow if you don't replace everything you own with the latest and greatest every two to three years?