that model has not been described as "disintermediation"

It's interesting that we can have something and not come up with a special word for it for many years. It's certainly not unknown for a word to be coined with one idea in mind and then have the public in general use it in a different sense. Whether disintermediation will stay with us us up to future history to judge. During the era of inkhorn terms many words were coined, about 10% of which stayed with the language.

In a related question, how long was it between the invention of the tin can and the invention of the can opener?