I mean you are more than likely right... As of right now it is pretty well known that Bitcoin keeps the altcoin markets "sane" in that they are a good tool for referencing the real time worth of an altcoin. Bitcoin is valuable, primarily because the cryptocurrency system depends on that.
The only thing that can be a downfall to Bitcoin in terms of how people value it, is that it isn't a physical asset that has inherent properties that makes it valuable. All of the value given to Bitcoin is no better than what gives fiat value... it's value comes from trust, and if there ever comes a point where people can't trust the Bitcoin network anymore there will be chaos not only in the Bitcoin ecosystem, but every single cryptocurrencies ecosystem.