Someday Bitcoin will, in fact, be in a bubble. But that day is not now, not even close.
The only thing I cannot agree in this article. Bitcoin will never be an economic bubble, because it is backed by the strongest force in Universe – Math! Yes, it's stronger than @lordvader and Darth Math together.
But someday Bitcoin can become a technological bubble, because stronger technology will probably find a solution for it's algorithm. Should that worry us? No, by that time there will be new cryptotechnologies and new “Bitcoins” to use.
But we always can laugh to those who are prophesying demise of Bitcoin while they're hoarding dollars :)
https://steemit.com/comic/@lighteye/b-c-stands-for-blockchain-sep-09-2016-bubble