I just dumped a few of my daughter’s a couple of days ago (after first copying them onto DVD). I guess if you keep them long enough they might be considered antiques, but the whole idea behind antiques is that they must be unique, masterwork or at least relatively rare. I know some gramophone records or old black&white pictures can be priceless, but most old novels or cassettes that were mass-produced in the mid-20th c are useless, and I doubt if they’ll ever be worth much.
I think the same goes for VHS, mainly because you need equipment to view them (unlike old books or photographs) and also because they’re generally low-quality, have to be rewinded, and can easily go bad (vinyl albums are a lot more durable for example, and could even be heard with an impromptu needle if need be, by a future collector or even archaeologist).
I say dump them in the landfill. Not all technologies are meant to survive the test of time.