Inherent value in a currency means that it can be used as a store of value and a medium of exchange, both of which bitcoin currently has. The speculation in the potential store of value has greatly inflated it, but it still has a store of value function - it's worth more now than it was up until about a year and a half ago, when all assets have been bubbled into the stratosphere. And it can be used, right now, as a medium of exchange and will be usable as a medium of exchange until it hits zero. Like every other currency that has ever existed.
I'm not getting into the quagmire of discussing whether Bitcoin is a smart currency, or a moral currency, or a better currency than gold, silver, tulip bulbs, beads, Deutschmarks, etc. All currencies have pros and cons. I think cryptocurrencies in general have a lot of cons that make them inherently speculative in nature, and if you treat cryptocurrencies as you would a casino, or futures contracts, than you're probably going to reduce your inherent risk when "investing" in them. If you're buying Bitcoin or other cryptocurrencies as a hedge against "inflation" of the dollar or whatever, you may or may not make some money depending on when you bought in and if/when you cash out. If you're "investing" in them because you think the dollar is going to fail and cryptocurrency is going to be the unofficial currency of Galt's Gulch then you're probably just a mark.
That said, since collapse is already baked into everything, digital currencies are only going to be useful when electricity is cheap and available to make transactions ubiquitous and easy. Once electricity itself becomes scarce, or even just less reliable, how much of your wealth do you want to be tied up in a currency that requires stable electricity access? That's the real problem that is looming for crypto/digital currencies.