If and when they run out of N5s it will be a sad day, as it is an excellent phone.
I, and many other people, don't want a 6" phone; the screen size is quite adequate as is and the phone fits in my pocket.
If, as was suggested, this is because Google's contract with LG is at an end, perhaps it would be possible to create another 5" phone as similar to the N5 as possible and at an equally competitive price. If they do, the one thing I'd like is a bigger battery and I'd be quite happy for the phone to be a mm or two thicker to accommodate it.