Since the overall dress code has become far more casual in the 21st century younger generations will grow up unaware of all the fun people used to have with their hair.
There will probably be a few hairdo revivals as future fashion trends are informed by styles of the past, but many cool hairstyles will most likely never come back because they're too much work to maintain.
Styles like the Beehive, Pompadour, Bouffant, Ducktail and Victory Roll were more than just classic 'dos- they were a sign of the times and set the stylish apart from the squares.
There were even a few revolutionary hairstyles worn by women out to change the world- the Gibson Girl look that loosened up those (up)tight Victorian hairstyles, and the Pouf worn by Marie Antoinette that screamed "excess is best" as hair was piled high above the head.
See 15 Delightful Hairdos History Has Forgotten at mental_floss