I really think it's about the old band.

To me, the lyrics and the quotes both point toward it. 

Like, "Forgive them that tear down my soul.  Bless them that they might grow old.  And free them so that they may know. That it's never, too late." 

Also one of the MLK quotes I think really says sometin'. "He promised never to leave me alone. No, never alone, no never alone." 

And another one that caught my ear. "All men betray, all lose heart."

But yeah, I dunno anything more from the rest of you so agree to disagree, whatever.