When RFC1149 was originally published on April 1 1990, it seemed that the entry barrier to implementing this method of encapsulation was too high. But as always in technology, time has seen change and it took a mere 11 years for a working implementation of TCP IP over Avian Carriers to surface.
Now with the advent of higher speed technologies such as ADSL, experiments in optimisation have been conducted on this protocol. The result: Carrier Pigeon is FASTER than ADSL!
Further biological carrier experiments were conducted a year later, with the discovery that even snails are faster than ADSL. Now that is progress far superceding even the likes of Moore’s law, I believe.