That is the solution. We see what you are describing with aerial drone displays that are popular. To create a photorealistic human would take hundreds of thousands of microdrones. Sounds far fetched, but I think we will get there if the money tracks that is.

Imagine a puck of sorts, about the size of a dinner plate. Now imagine the same size plate about 18 inches above the other. Both plates could have a circular pattern of minute holes. One of the plates could pump out a thin haze and the other could capture it to be recirculated or vented out. A projector or series of projectors could create the "hologram".

Wonder if that would work?