I dunno. I think had I been having lunch with Mr. Oosting when this adapter was being considered I would have remarked "It's neither fish nor fowl, and will likely struggle to find a market."
Smartphone cameras are already more than good enough for snapshots and for recording the daily lives of their owners - the usage to which they're typically brought to bear. And they have the overarching benefit in that they are always there.
Serious photographers, on the other hand, usually want a serious camera. I can't imagine many being attracted to what amounts to a Frankensteinian point-and-shoot.
Leica's collaboration on the Huawei P9 was a similar misadventure, I suspect.
I could be wrong...