At the moment it is speculative. You can believe in the blockchain technology and still think bitcoin will crash I think.
However, there is a vast amount of infrastructure being built around bitcoin the currency, which adds value (cash stations, merchant integration, etc)
And of course, lurking in the background is the entry of wall street, which would be a game changer imo.
Even with new merchants, the price of bitcoin is still tied to fiat. And it's laughable seeing people arguing this idea.
So tell me, if 1 bitcoin = 1 bitcoin is all that matters....then whyaren't you able to walk into a dealership and buy a lamborghini with 1.0 btc? Why can't you go on overstock.com right now and purchase an asus laptop for 0.3 btc? Yeah. Because its purchasing power is forever tied to the U.S. dollar.
Assigning a fixed, 1:1 arbitrary value to itself doesn't work in the real world when you want to use it. If its market value keeps dropping (which, this has been one of the first stories I've seen on the national news, which just happens to be the crash of bitcoin price tonight) no new individual investors are going to want to touch it with a 10 foot pole. Lol, why would anyone want to sink money into an ulta volatile ship while it's soaring head first to the bottom of the sea with no sign of rescue?