I'd say modeler users, at least the ones active online, are pretty fickle and quick to jump on the "latest and greatest" new device. The regular stream of updates from Line6, Fractal etc keeps people with their chosen device but at some point there's just not that much to add before a new-fangled device is due.
Even if NDSP get the editor and plugin support out this year, that still only means they are at the starting line for the promised feature set. And still don't have a freakin' graphic EQ that looks and works like one.
Then all it takes is for a next gen Line6 or Fractal unit to release, or maybe even just some good Tone Master Pro updates, or a cheaper "Tone Master Pro Junior" to be released for people to forget all about the QC.