There's no possible way for U2 to top the size and scope of their 2009-2011 stadium tour. It grossed $736,000,000 over 110 shows. That's a record that may never be broken. They shouldn't even try. When their next album hits in 2013, they should go back to arenas instead. It also might be time to drop some war horses from the set lists. Sure, "Where The Streets Have No Name" should be played at every U2 gig until the end of time, but maybe we've heard "Pride (In The Name of Love)," "With or Without You," "New Years Day," "Mysterious Ways" and "One" enough times. They're all great songs, but they've been played to death.
It would be even more exciting if U2 considered actually rotating their set lists from night to night. Pearl Jam and Bruce Springsteen shows are so thrilling because you never know what's coming next. An act with as deep a back catalog as U2 should at least set aside a few slots per night where they mix it up – maybe bring back early favorites like "Drowning Man" or "The Refugee," or forgotten 1990s tunes like "Acrobat" or "Gone."
At this stage in U2's career, it might be tempting to just keep flogging the same old hits in stadiums for enormous sums of money. They need to resist that temptation at all costs.