Plus, all of the big 3 lose money on their flying. NK isn't alone there. Their network size makes them money through corporate contracts and credit cards.
NK is losing money due to its lack of the above and it's brand (sorry). Both of those obstacles would be removed if folded into a national carrier. Any airline that made a purchase would grow it's network and make its contracts and cards more valuable.
Again, a CH 7 is very possible so I'd be preparing for that, but it ain't over til it's over.