There's too many competitive teams in Europe for a Super league to be viable. It's a nice idea and all but we're getting as close to a permanent system with the way it is now, most likely looking at reducing the number of teams in both England and France which will take some doing.
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Oh yeah, thats true, but think about it. How did the NFL and the NHL come into being? By symbolic merging of leagues and divisions.
We already have the leagues (the GP, the ML, the French and Italian leagues) and thus the divisions. We already have a center piece cup competition: the Heineken cup!
Thus the answer is pretty easy: a four division super league with the top two teams from each league get to play in the playoffs. The winner gets the HC and wins the league!
We preserve the existing league structure, cut back number of games all the way back by removing the pointless domestic competitions and still preserve the high octane competition of the HC!
Also it'll get rid of the stupidly uncompetitive situation in the Magners League where at least one team from each of the Celtic nation gets into the HC. If this system was put in place, teams in the ML would for the first time have something to compete for other than bragging rights.
The European Challenge Cup can be downgraded for all the little teams outside of Western Europe and maybe a similar sub-super league for the Spanish, German, Romanian, Georgian and Russian teams can be set up too!