it means that the band is about to fall apart only to get togehter in a few months to play a greatest hits show.

The flimsy stairs probly signifies an unsure future, maybe for you, for the band, for somebody or something. Maybe you fear for your or someone else's eternal future. Maybe people have said in the past that it's not a good idea for wittnesses to have a band (why?) or maybe this dream signifies a fear that the bands success could draw one away from the truth. or mybe it was just a dream.