You can't get rid of the opening act. This is a long lasting tradition of Rock n Roll. The opening act is an essential part of the night. It acts as the grease to lube the wheel so to speak, it acts as a springboard for up and coming artist, and it allows band such as U2 to bring acts that they respect and show them to their audience. It's U2 giving back to other artists. Obviously U2 in the past has had it's hits and misses with this. They did a great job choosing artist that would make their audience think like Public Enemy and Rage against the Machine. They brought truly talented and overlooked artist like PJ Harvey and the Pixies. And then they just got plain lazy and picked crap bands like Smashmouth and Third Eye Blind. But overall U2 has done an amazing job of bringing band into the light. Obviously some of the opening acts have gone over better than others. And you're always there to see U2, so sometimes it may make it unbearable to sit through a band you don't know cause you're filled with such anticipation you can't concentrate. But all in all, if you take the opening act away from a rock show it's like taking the foreplay out of sex.