I've been convinced of this theory for about 10 years. I don't know why people can't wrap their heads around a 3D version of the Holographic Principle (as opposed to the standard 2D version of it, per Susskind, etc.), or indeed an N-dimensional-manifold version of it.
This guy did tho... (he gets into the good part right at about halfway thru)
https://www.youtube.com/watch?v=A8bBhkhZtd8