Soccer is going the way of having a European Super league within the next 10 years to make more money and it'd definitely work for rugby too. TV revenue is the way to make money these days, the more lucrative a product you have, the more revenue and coverage you'll get which leads to exponential growth. The Top 14 is light years away from making money in Asia but with a European super league you have the best players in the world playing against each other every week all across Western Europe you'll definitely be able to sell it in Asia and North America because it'd be the best product in rugby behind the World Cup. The final of this competition would have no problem selling out the Camp Nou or Wembley, there'd likely be regular season games that could do it after it establishes itself, it's also a viable product to sell out stadiums in North America too, it would most likely eclipse the earning potential European rugby has in its current format.
The Top 14 et al would become development tournaments like the ITM cup which will help the national sides.