I just don't see this being an issue in the current climate, rugby at this current moment (in my opinion through mismanagement from world rugby) is a niche game that is huge in only a handful of nations, normally these break aways come in. Sports with large footprints and as others have stated with infrastructure in place. Rugby doesnt have that, rugby is more like cricket but without a nation as rich as India having it as their number 1 sport to drive private investment worldwide.
The sport cant even get a foothold in America never mind a privately funded supper league where your audience is limited and their is little money to be made. England, one of its biggest markets struggles to run a sustainable domestic game that it now ring fenced and still often runs at heavy losses.
We love rugby obviously, but on an international Money making level, it just isnt a factor, France is the only country that has somehow managed to get a league system that runs at a profit and increases private investment. Ireland or Leinster to some degree as well, but thats much more a region of a country being so in love with the sport they invest at a loss due to the passion for it.
Should it's be more popular worldwide? In my opinion obviously, especially 7's which in my opinion is one of the best shortened formats in sport and could easily bring in new audiences and help support 15's as Argentina have shown with their 7'ss being a pipeline into 15'.