Bitcoin itself is too well-popularized to have good odds of being a reasonable investment in terms of risk vs. reward. The risk is absolutely huge, and the potential reward is already priced in. Total meh. Unless you're actively doing something to increase its odds of success (buying & holding it is not such a thing), it's a crap investment for the ordinary person.
Spork's point about "some cryptocurrency, some day" possibly being a huge thing may well be right. But it may not be Bitcoin, and it may not be in the next few years. But a warning here: The "alt-coin" space (cryptocurrencies that aren't bitcoin) is the wild west of currency speculation and fraud. Most non-bitcoin coins that are being created are purely coming into the existence for their creators to make a quick buck. Copy the bitcoin (or some other) source code, change the name, tweak a few parameters, and then try to hype the crap out of it and get people to pay real money for it. Then stop "developing" it (hah - as if they were in the first place) as soon as you manage to sell a few thousand bucks worth of it back to bitcoin. Wash, rinse, repeat. Everyone in the game knows that this is what happens, but there are new suckers entering all the time.
(I've
played that game to win before, and I'd advise folks to stay away from it.)
There
are legitimate startups playing in the bitcoin and cryptocurrency space, of course, but as with anything, you've got to ask yourself whether you really want to invest significant money in a single, high-risk startup (regardless of whether they have the magic word "blockchain" in them or not). For most people, a diversified investment base makes a ton more sense. I doubt that's a point I need to belabor around here. :)
Of course, I "meh'd" bitcoin back when it was new, and I was clearly wrong then. :) But now that you've got professional investors playing around in this space, it's not likely to be a hidden gem investment opportunity. It's a huge gamble. Don't gamble.