die off vs go the way of the dodo

To become defunct or nonexistent. 

To suffer a series of deaths; to die one by one; to progressively become extinct. (If a group of plants, animals, or people dies off, the entire group dies over a period of time.) 

Of music, noise, etc., to reduce in volume until no longer audible. 

To go extinct or become obsolete; to fall out of common practice or use; to become a thing of the past.