Actually there has been a bit of a resurgence in the used watch market, especially among rarer collectable models. It is still more of a hobby than something to invest in hoping for a good return on investment. I don't see why these Apple watches couldn't be updated and rebuilt in future, we'd have to wait for a tear down to see what's inside.
Here's mine, 1967 Oyster, after spending $A1600 for Rolex to restore it. It depends on how limited, the limited edition is, will it be numbered as part of a series? That will give it some future value. I can see a single Product Red auction version going through the roof, maybe platinum.
There seems to be a double standard among Americans, they are all ready to jump on their high horse as far as Apple's Chinese workers are concerned, yet ignore the struggling worker who hands them their lunch.