Sure, Lionel could license Super-O to an outside supplier. But since it would be competing with their existing FasTrack line, I'd be pretty surprised if they did so.
That said, if Super-O became available in the same array of diameters as FasTrack (including switches), I wouldn't hesitate to convert my FasTrack layout to Super-O. Back in the Seventies, I had a Super-O layout, and I had no problems whatever with it.