As someone still using an HTC One M7 and loves it, I don't think HTC's heart is in it anymore. The M9 was a retread of the M8, which itself was just a "refinement" of the M7. And somehow, despite two generations of refinement, the camera is still mediocre.[0] To boot, the HTC-built Nexus 9 got disappointing reviews, mostly due to build quality.

I wouldn't be surprised if they get out of the smartphone business altogether in the next few years to focus on stuff like the Vive or the RE camera.

[0]http://www.forbes.com/sites/ianmorris/2015/05/25/htc-one-m9-...