At some point they'll stop making better and better and more capable cameras. MAYBE. Maybe not. But until then, if the new one comes in at 24mp with a flip up screen and/or a built-in EVF, there will be some upgraders. There are rumors of a 24 mp Ricoh GR replacement too and you know that'll sell to the Ricoh-philes. I don't have much desire for 24mp the way I use the Coolpix (or Df for that matter), but if they magically make it even better in low light or improve a couple of key features, I might eventually go for a new one.
I'm running really REALLY low on GAS these days, but mostly because I got over my fear of DSLRs and now I don't feel like there's ANYTHING better out there than what I've got, let alone something I'd want to shoot with. But before I got to that last step, I'd always be looking for a leg-up with the compact mirrorless cameras and I don't think this would be any different. Although the exponential improvements in sensor performance seems to have finally plateau'd in the last couple of years, so maybe it's getting tougher to sell new gear without the promise of a truly better sensor...
-Ray