I believe you are wrong. Bitcoin is a decentralized network which is difficult to stop, but not impossible. Semi centralized networks like Kazaa and Napster are great examples. If you want another example of a completely decentralized network then applications that use gnutella are great examples, like bearshare.
In all cases, the legal arm of a few entities straight up discouraged the use of all these networks forever through extreme legal action and mass marketing. Remember the stories of people getting crazy fines for downloading a few songs? They didn't do that to punish that person. They did that to intimidate everyone else and it worked. As recent as 2010, people has been attempting to develop clients for gnutella. None successful at rebooting the network. To assume bitcoin is somehow immune to this is lunacy.
The most impactful thing that I've seen was the rise of netflix and the ease of getting legally paid for content making torrents not worth the effort. With the splintering of streaming content into many different services, I'm drifting back to torrents and finding it as reliable as it ever was.
All you need to do is make it illegal to convert bitcoin to fiat and vice versa. Bitcoin is used for speculation, and not as a currency. Having bitcoin without being able to use it is pointless, and the only way to use it right now is to convert it into a usable currency. Yes, people can use some shady offshore exchange, and risk major KYC issues with moving that fiat. The key point here is that very few people would do so. The price of bitcoin would crash, and that alone would stop being from wanting to buy it.
You're right, though, that money is probably a special case, because it is designed to have limited supply (or at least sound money like Bitcoin is), and its value is related to its velocity.