4. The Rolling Stones
Contrary to widespread belief, the Rolling Stones never went on any sort of farewell tour. Before every tour, they're asked if it's the final one, and they've never answered in the affirmative. Still, with only two new studio albums in the past 20 years, they're hardly at the peak of their creativity. The band is simply a touring machine and thus a money-making juggernaut. Some tickets on their last tour were upwards of $800, meaning they're pricing out a huge deal of their fanbase. Factor in a setlist that is a little less than adventurous, and even many diehard Stones fans are disillusioned.
All that said, their last tour was their best in years and bringing back Mick Taylor (even on a few songs) was an inspired move. If they come back to America, their show is well worth checking out. You never know when it's going to be the last one.