It's hard to imagine seeing as Apple products are the integration of hardware, software and good design. It's like trying to imagine an a 3rd party tablet that runs iOS.....I just can't get my head round that.
There is so many potential problems, ie. where do the Apps come from and how do you get them on the Watch.
Added to that, there are very few devices on the market that can match the design and build of Apple products, so again, it's hard to imagine a good looking smartwatch that runs iOS flawlessly.
Anyway, if somehow, some manufacturer managed to do that, then of course I would be interested, but I certainly won't have paid the same money for it.
The problem I have, is that mobile phone, tablet and possibly smartwatch wise; the only manufacturer that I would regard as premium and am willing to pay premium prices for, is Apple. I have a hard time thinking of Samsung and LG etc of being premium manufacturers and as such, although I would still purchase their products, I certainly wouldn't want to pay anywhere near as much for them, even if they are regarded as comparable or potentially better.