I think this is a big wrong. Bitcoin may be fungible as a coin because all the other coins after him are almost the same so one or another may be almost the same. But you forget something very important and that make bitcoin unique. The technology behind it. This disruptive technology which will support always only bitcoin make it irreplaceable. It will be always so.
Apparently you fucked up your quotes but either way I fail to understand what Bitcoin technology has to do with its fungibility ?
It's so easy so I have not possibility to explain. The technology which invented bitcoin will support its invention and not the other coins which are the clones of it.