Mass market cars become obsolete eventually, and many of them aren't considered special or unique enough to achieve generally recognized "classic" status, like the Ford Mustang, Chevy Corvette Stingray, that kind of thing.

I don't know what some people are worrying about because surely there will always be a few preserved models of these cars somewhere (museums, collectors etc), don't the main manufacturers (although ones like Austin don't exist anymore) keep their prototypes and final commercial release versions stored somewhere? The Vauxhall Vectra is common now, one day it'll be one of these "vanishing cars", but I don't think that'll make me care about it any more. And the day it becomes a priceless historical relic, I'll already be dead.