Just commenting to leave my footprint for when people look back on the discussion a few years from now.
The high price seems like it'll be a barrier to adoption, which will limit the amount of developers willing to invest time in developing for a closed platform.
It'll probably take off in the furry / kink scene. The real killer app will have something to do with sex or porn, and Apple will try to kill it off or refuse to acknowledge it.
On release day some couple will record a first-person POV sex video and upload it to a major porn site. If the spatial video recording experience is really good it might take off in the porn space.