Ok so if one human player dies in the first map he has to wait for what, the next campaign? Or is that sill not realistic because he's still dead then so....maybe it should go across all campaigns? or forever maybe? So if you played and you die you can never play again, only new players, now that's realistic.
And what happens when everybody dies, empty saferoom? Or didn't you think about that yet?
This is one of the most stupid ideas I've seen in a long time lol. Games are not realistic, deal with it