Lifetime warranty

So I was telling my mother, Tupperware has a lifetime warranty. She said yes, but if they no longer have that product, they will replace it with something different that is currently in stock. I said, but at least the product will last long... She said, so long that when you replace it, they will no longer have the product you want. And I was like, why do you keep wanting to replace the product? I just want the product to last without needing to replace it!

I wonder, how do most people view a lifetime warranty? Do you just think it will last forever, or are you already thinking of how to claim your warranty when it breaks?