I assume that's worldwide? That definitely seems niche to me compared to the global population.
If this was such an insignificant niche, Apple Watch wouldn't even exist, would it?
>The global smartwatch adoption rate has reached an impressive 21.7% of the adult population
...
>The adoption rate of smartwatches is expected to continue growing, with industry projections suggesting that it will surpass 25% of the adult population shortly.
I don't believe a fifth or a quarter of the adult population could rationally be called 'niche'.