It's tragic what's happened to that club, their fans are some of the most loyal, diehard supporters on the planet (not to mention a great stadium sponsored by a fantastic beer).
If they are relegated, it's very likely they'll be denied entry to the 3. Bundesliga and have to join the Regionalliga Division.
For any older fans that remember German football back then, some other clubs from the big time back then who now play in that division include Carl Zeiss Jena and Lokomotive Leipzig (they were VfB Leipzig at the time).