I dunno lol
The J5 (no evf) is only slightly cheaper than A6000 (evf)
J6 has to be utterly amazing to beat the competition
IMHO Panasonic has set a pretty high bar with their G85. IBIS, 4K, outstanding shutter, flippy screen, great RAW buffer, fast viewfinder, etc. Nikon's problem is that this is <$900 so their V series would have to be
significantly better than this at the same price point to gain even marginal sales volume or has to be
significantly cheaper than this with similar features. Nikon currently prices the V3 more expensive than this with less features (and they wonder why the system is not doing well LOL).
For the J series, Nikon has to decide who it is really serving. As zzzxtreme aptly points out, Nikon is being caged in by Sony mirrorless cameras as well. Given the rise of dual lens smartphones, Nikon should move the J-series upstream. The existing V3 should really be the options the J6 should have (e.g. attachable viewfinder, grip, etc.) and Nikon should keep the price at the J5 level to be competitive.