How soon can we expect to see this technology on our desktops?

What is the state of nouns of 'solid-state' data storage devices (using holographic technique, for instance)?

How soon can we expect to see this technology on our desktops?

The future you speak of may require/entail a revolution surrounded by computer capacity and speed (such size and speed that may make holographic displays possible). Such a revolution may achieve with molecular computing, a biological nanotechnology. The join below will refer you to another question on Y!A that relates to molecular computing.
That is available contained by commercial server systems. You are not likely to see it surrounded by desktops until the terabyte hard drives enjoy reached open market saturation.
maybe within a year...

haha

just jokin

I don`t know in a year...

or contained by a million
Another 20 years.
in 20 to 25 years most feasible, or whenever it is developed to the point where it can be released onto the mass open market.