Isn't this kind of like the automobile? Henry Ford invented it and now (and for many years now) many other companies have been building and selling cars of their own making? I am sure Ford had a patent but other companies built and sold their own line just the same?
Same principle applied...a rolling chassis powered by a gasoline combustion engine, but with slightly different body styling, different colors and different names? Innovations by different manufacturers made the subtle differences....V-8's, Hemi's, coil over suspensions....each company added their own signature modifications to make theirs a unique creation....and there was room for many building cars. I know there is room for many building plugs and enough innovation to make them unique in their own way.
Build it and they will come.