"Tiki-taka" doesn't work because we don't play it properly anymore. Tempo variations, one-twos, probing and moving the ball quickly from side to side to provoke a gap and tire the opponent out, choreographed combinations through the center, high pressure. None of that is there. We've only seen glimpses against Atletico Madrid in Camp Nou after Cesc went off. That was old school Barca. Nowadays Xavi gets the ball, plays a long diagonal to Neymar who then tries to dribble his way into the box. Alternative: Ball goes wide to Alves who crosses it into the box. Rinse-repeat.
How do you want to beat Real Madrid by "ceding possession"? They are the masters of this playing style with the ultimate counterattacking players. Ronaldo, Bale, Di Maria, athleticism in midfield and defense. It's a weak idea to try to "out-vertical" them. They are faster, taller, stronger. However lots of their central players struggle against movement, pressure and quick combinations (Ramos, Pepe, Alonso in particular). But we don't do that. Neither did Bayern.