Sorry @tarantulaz is more correct on that point in the present environment. People want to cash out their rewards and you can see this easily in the steady stream of coins flowing from authors to exchanges on the blockchain. Only if someone wants to buy in will the tokens be able to retain a value.
In a fantasy land where reward-earners are happy to stay within the system and enjoy their larger share of the Steem pie, buyers wouldn't be needed, but that won't happen for a long time, if ever.