The idea is interesting but it's disconnected from reality.
Change in the physical world is very slow, bet young people will still know what a watch or any everyday life item is in ten years (way more than the average software life). I understand that some people would find an UI for a music player with some photorealistic speaker or a fully wooden bookshelf library ugly but don't tell me people (old and young) don't know what it is. Or more far fetched I could still understand medieval fort icon on a firewall. I admit some are already forgotten like the floppy disk but they are an exception.