"or Bust", is really when you mortgage the future for the chance at winning it all now. Sometimes that's salary cap related and sometimes it's just having a bunch of 1-year rental guys that you know won't be back. But then again, with regard to the "window" talk, if we were to lose Daboll, Frasier, and perhaps a couple assistants, then you might not have this chance with a new group of coordinators.
Look at Dan Marino. Got in the big show his first year and never made it again. The morale is, you just never know.