I agree that Apple could withstand the watch being a total flop (for Apple) without any real trouble, and they'll probably outsell other smartwatches by a comfortable margin. But I have a really hard time imagining it reaching anything like the same scale as, for example, the iPad, or staying sustainable over the long term. Apple is good at taking market segments where there's demand for a good product, and existing products are lacking, and finally getting it right. I just don't see that demand for a watch.