>>Who's realistically going to use a laptop/desktop with a Core 2 Duo (2006), for instance?

I was literally still using a Core2Duo Macbook Pro as a kitchen laptop just for looking up recipes and watching youtube videos etc until last year. Worked absolutely fine until Chrome decided that it's not going to update itself anymore and since I'm on an old version of chrome I can't use google sync. That's what killed it for me - the hardware itself was still perfectly functional.