They have to or English clubs can stop playing in Europe. there is not enough police to protect them from angry european fans.Either way, the UK government is apparently going to use any means necessary to clamp down on it, two of the biggest match broadcasters, Amazon and Sky Sports have indicated that they won't be showing Super League games. Jurgen Klopp's threatening to walk, Alan Shearer is calling for blood, mobs turning up at stadiums protesting.
the Italian clubs would also be pretty much dead with massiv amounts of fans walking away.
It maybe works in spain, since they are all even worse sellouts than anglos but it would also end Spain on an international level.