Not leagues per se, but the Champions League will be only won by 10 different clubs for the rest of its history. (in order of UEFA preference for marketing, brand value, and making money in general) Man United Real Madrid Barcelona AC Milan Liverpool Inter Juventus Arsenal Chelsea PSG/Man City/Anzhi/any other noveau riche club. With the first winner of that lot to take up 10th spot. It will kill off the other great clubs of Europe. Porto, Benfica, Sporting, Athletic (Bilbao), Napoli, and so on... that don't have anywhere near as much marketing potential as those 10 or so I listed above.