Holo... R. I. P.??
People under 25 don't use the term Holo (at least from my own observation), because they didn't grow up during the time when it was used the most. It's out of reach of a growing population. Not saying that it couldn't catch on again, because it could, but there isn't a clear, consistent definition for it. Holo could mean projections beamed on water mist, AR, VR, 3D displays on transparent glass, etc. Microsoft's use of the term in HoloLens (funny because they call it MR) may have hurt their efforts, because it sounds like out dated technology or like it's managed by very stubborn, know it all guys in their 50s and 60s who are out of touch with today's youth.
I don't see Holo taking off but hey, it could happen against the odds... It's just not going to be easy, given that it will have to compete with other terms that are rapidly increasing in popularity (AR, VR, XR) as the public becomes more educated and familiar with immersive technologies.