I find your analogy particularly fitting, albeit you miss the point, perhaps because you are not into either cameras or watches.
Compact cameras are not doing too good, because you can shoot pictures with your phone. DSLR and mirrorless though, are doing swell, with even better projections.
In the same way, I think low end watches (mechanical+smart) will suffer a big hit, but high end watches ($1k+ will not see any difference at all). It's just different market segments. You don't see Martinelli worried about Ikea opening a factory every eayr. They just sell to different people.
I've tried to make that point to people who claim that Apple has ever shrinking market share in the smartphone market. It might seem so to a person who has no idea about marketing, but in reality, Apple's share in the high end segment of the market is increasing.