I think you miss the entire point of bitcoin. Perhaps you should investigate the underlying technology. How much is TCP/IP worth? Hundreds of trillions of dollars.
The value in Bitcoin is the fact that the bitcoin blockchain has, by far, the most development on it. Its value exceeds everyone else simply for the fact that developers have created more applications on it (and are continuing to do) than any other blockchain. Ethereum, which is second, isnt even close.
So when you have a business that is built upon a blockchain, that, in essence is locked in. Why would you switch? And, as with your example of windows, notice how it evolved with each updated version. Blockchains do that also.
And the idea of thinking about physical existence in a digital world is completely off base. There is very little physical about Facebook yet it is valued at almost $500B.
Let me ask you this question: how often do businesses in your town up and move their location? Do they do it on a whim? Does a store move three times in a year? Of course not. And why not? Because, to start, it is a major pain in the ass to move. Secondly, ones business, especially retail, often depends upon location whether it be for client convenience of so customers can find them. Either way, moving to another location is a huge business decision.
It is the same with blockchain. Companies that develop on one blockchain arent going to up and move to a completely different blockchain. It is akin to a retail location suddenly picking up and moving across town. Now there might be a legit reason for doing it but it will be considered long and hard.
Bitcoin is the platform, the protocol....everything you mention is an application. That is the difference. Windows is an app. Facebook an app. All built upon TCP/IP which is the protocol. Bitcoin is the protocol.
Bitcoin isn't the protocol. Blockchain is the protocol. BTC is more like the prototype/Minimum Viable Product. Think of it as the first iPhone. It's a piece of garbage at the moment which cannot even run most of our apps. But the smartphones live on. Some are from Apple, some from other companies. The original however is nothing but a relic after a decade. It'll be the same for BTC. It's like an old videogame. BTC will have a historical value. But 99.999% will not use it. You can barely find anyone still playing the COD:MW games. In few years BTC will simply fade away like Nokia or Internet Explorer.