@jojof hits it on the head pretty well with the gold analogy. Even though BTC is less useful comparatively to many other altcoins, it is still the "grand-daddy" of cryptos. The original/classic currency tends to keep value even if it seems illogical. That's not to say it can't "pop" at some point, but the whole market will most likely follow suit. As to how they all rise from the ashes thereafter... that will be the exciting part :)