3. Pink Floyd
First off, the death of Richard Wright made a full reunion of the classic Pink Floyd lineup impossible. That said, David Gilmour, Roger Waters and Nick Mason could still tour as Pink Floyd and fill every stadium in the country 10 times over. They did all share the stage at a Roger Waters gig in London in 2011, but it's easy to imagine that being the last time it ever happens, because David Gilmour simply has no interest. He's made this clear over and over, and he's got so much money that nobody can force him to do anything. He didn't even want to tour as Pink Floyd without Roger Waters after 1994.
Roger Waters has been carrying the Floyd banner for the past decade, though word is that Gilmour is gearing up for a new album and possible tour this year. These solo gigs are as close as you're likely to get to Pink Floyd ever again.