Steamspy is highly inaccurate, but I do think Vive sales are generally healthy, and it seems like they are making them about as fast as they can be sold now. It has enough of an install base for quality content to make it onto the top 10 list when they launch, as Pool Nation VR did a few weeks ago. The general public still has not tried VR (barring maybe cardboard) and a very vocal group is against the very idea of it. Still a pretty steep mountain to teleport up.