Right now its proponents are valuing it like a tech startup stock- what's its potential future value?
Its opponents have already decided it will fail.
Either side may be right at this point, though bitcoin has more going for it than it did six months ago.
To me, the trend is currently towards "it's going to work", so I think it's worth a gamble. But it's definitely a gamble.
I think cryptocurrency is without question a force for the future. It makes exchanging money too easy and too fast for it not to eventually dominate economic systems. Economies/companies that don't use it will be at a disadvantage.
What's in doubt for me is whether bitcoin will be the winner of the cryptocurrency market.