I was going to make a site called "unicornmaker.com" as a bit of a joke where it would buy one billionth of your company for $1, in return for a $5 service charge and would provide a nice certificate and press release for you. Didn't quite get round to it though... Then everyone could have a billion dollar company.
I think the term Unicorn will only be buried when the bubble finally bursts, i.e. when most of these unicorns burn out within a few months of each other.