Likely, if NASA has gotten this far, it means it's within 5 years of being put onto the public market.

Think rechargeable cordless power tools and mowers: the concept came from the need for fuelless, cordless, low energy chargeable battery powered tools to repair the space station. They weren't expected to catch on as long as there were the older methods of running power tools on earth. But, when an innovation like that was not only plausible, but cheaper and more convenient, corporations paid attention, worked with NASA's research, and made it happen.