Where did you hear this, can you post a link, also i wish John's ''fans'' would stop comparing him to those other guys. I'm a fan of Fogerty, but at this point he's a nostalgia act, ditto for Seger. As for the other two, i admire them as songwriters, but their voices are like nails on a chalkboard, i couldn't care less if they played for twelve hours straight.
Here:
http://forum.mellencamp.com/index.php?topic=2553.0
In this day and age it's about a dollar and for JM ticket price 13 songs is a joke......should be at least 20. But hey he hasn't taken care of himself the best (health wise) maybe at 62 he just can't rock it anymore time-wise. Springsteen is 64 I think.