Who would want a 8inch phablet anyway? because it is too big to be a phone and you look stupid when you are on a phone call with it in public.
And i think phablets are fads.
By the way what is a niche product??
A device that appeals to only a certain group of users ...
Niche market. A niche market is the subset of the market on which a specific product is focused. The market niche defines the product features aimed at satisfying specific market needs, as well as the price range, production quality and the demographics that is intended to impact. It is also a small market segment.
For about 20+ years all Macintosh Computers were classed as Niche products due to their tailoring to certain professional customers and price point over the PC.