Personally, I don't think it offers enough over 9mm to take any appreciable amount of market share. It's been around for 2 years now, and only has like 3 manufactures making pistols for it.
Who knows? Maybe it will fill the '380 is not enough and 9mm is too much' niche. -- Is that a thing? Maybe for women, and effeminate dudes?
That caliber will be the next wildcat to disappear, not many manufacturers are even still making guns in that caliber. I would only own one if it was free.