Solar Glass ~ Who Will Own This Multi-Billion US$ Sector?

All buildings need coatings, whether brick or concrete or, increasingly, glass. If glass, why not Solar Glass, a photovoltaically active variant of the norm which converts some fraction of incident photons to electrons. Surely all buildings, especially those in sunny Middle Eastern, African, and other equatorial regions should be clad with Solar Glass! But who will be the suppliers? The current PV companies like Evergreen or Q-Cells or Sharp or the others. Or will it be Building Materials rockstar companies like Vitro, Asahi, or Saint Gobain...