... and should it be treated as the fundamental protocol layer of the massive network of trust and value called "economy"?
From a data and transaction management points of view, it isn't a network and therefore, cannot act as the foundational protocol of a network. That actually matters a lot in the grand scheme of things.
(There's actually about a joke about cryptocurrencies being a thing that combines everything you don't know about money to everything you don't know about computers. Not funny! Decentralized systems development, especially decentralized data and transaction management, is something that's not too well understood in the computer sciences.)
Technically speaking, most blockchains, including Bitcoin, are massively redundant inherently trusted databases, where both the data and transactions are managed in a redundant manner. That in itself is a huge innovation. An inherently trusted database with redundant transaction management capability did not exist before Bitcoin. As such, it probably has some significantly value. Just do yourself a service and don't pretend Bitcoin to be a network that is the foundation of everything. It is "just a database" capable of managing certain assets in a censorship resistant manner. If you add nodes to a blockchain system, you add neither the capacity nor the functionality of the network. You just increase the redundancy and censorship resitance level of the database system.
Can Bitcoin act as the foundation of a bigger digital network of trust and value? I don't think so. Any database engineer knows, that trying to build... (More)