Let's not forget that that Sven always has the option to drop players if they're not playing well, the way he panders to the stars their stand ins must be chomping at the bit to take their place and it's not like we have no strength outside Sven's first 11. The buck must stop with him even if you don't think he should be motivating his players (which his calm demeanour is hardly likely to do, probably brings them down if anything).
And if Sven can't be expected to motivate the players what exactly does he do for his money? His experiment with tactics only served to unsettle the players and pointed to his poor decision making... He only dared drop Rio because he himself said his form hadn't been good and we had Sol to come in who's at least the same level.