USELESSNESS
dead on one's or its feet
exhausted; worn-out; no longer useful.Ann is so tired. She's really dead on her feet.He can't teach well anymore. He's dead on his feet.This inefficient company is dead on its feet.
have had its day
to be no longer useful or successful.Streetcars have had their day in most American cities.Some people think that radio has had its day, but others prefer it to television.
white elephant
something that is useless and which is either a nuisance or is expensive to keep up. (From the gift of a white elephant by the Kings of Siam [Thailand] to courtiers who displeased them, knowing the cost of the upkeep would ruin them.)Bob's father-in-law has given him an old Rolls-Royce, but it's a real white elephant. He has no place to park it and can't afford the maintenance on it.Those antique vases Aunt Mary gave me are white elephants. They're ugly and take ages to clean.