The argument, that seems to come mainly from the EU, is that competition is of benefit to the consumer but I don't really see that.
Sky hasn't gone down as a result of losing the Champions League, in fact its gone up. It won't go down as a result of losing the Ashes.
So if you're a football or cricket fan you now need to subscribe to both Sky Sports and BT Sport to get full Premier League, Champions League and FA Cup coverage. Similarly with the cricket, England home internationals, including the Ashes, on Sky, Ashes in Australia on BT Sport. Rugby is also split over Sky and BT. Fan of motor sports? Sky for F1, BT for MotoGP and Premier for Nascar. Boxing is split between Sky and Box Nation but if you also want UFC that's on BT. Fan of American sports and you need Sky for NFL BT / ESPN for MLB and NBA and Premier for NHL.
If you want the lot that's £70 a month just for sport!