I am not as sure the N1 line is doomed. Of course I own over a thousand dollars worth of it. Here are my thoughts in no particular order.
1. Every major camera company makes a mirrorless system and updates or improves them. Therefore, there is a valid commercial reason to have such products in their product line. (I am not counting P&S products.)
2. Given that, it appears no camera company can survive and prosper now with a good mirrorless ILC system in its line. A big assumption but I believe it is correct. I do not think non-professional users want to have to carry around heavier camera and lens combinations for regular use. So, the market seems to be users who want something fully functional (fast focus and capable of use in lower light) not heavy, bulky, loud or expensive).
3. Much of the cost of developing the N1 system has been absorbed over the years since its introduction, so massive new R&D costs would not be needed to fix most or all of the perceived N1 system shortcomings.
4. For example, modifying the V3 to become a more capable V4 could be as minimal as a new sensor and a standard hot shoe. If longer battery life is a problem, a battery grip could be a possible answer without a major internal redesign. If micro-sd card switching is an issue, buy a larger capacity card. Also, stop bundling it with a useless lens.
5. Parents have been issued for many needed lens upgrades and await only production
Summary: Nikon needs a good mirrorless product and has the viable foundation of one in the N1 system. Much of the R&D costs are long since paid for. If needed, rename it to something else or "N1+" or whatever. It can be done.
Thank you, and fire at will.
Nikon user since the EPO days.