Jim Schmidt (possibly the finest folder maker in creation, IMO (RIP)), once said he wouldn't own anything that didn't age. You're always going to have people that like the traditional carbon steels, and those who like the newest, high-tech super steels. Personally, I like the way carbon steels cut, and if you like your knives, and invest a lot of money into them, you're going to take care of them. There is, and always will be, a market for carbon-steel knives. Stainless knives will probably hold up better, and will look new longer, but again, there is a segment of the knife-buying public who wants knives what rust. I've found from carrying them that as long as you wash and dry them off, and take minimal care of them, they'll give good service, and after a while, will develop a rich patina that actually looks better than new.