Of course it is a totally unsustainable bubble because anyone with a minimum knowledge in the altcoin market knows that there are countless altcoins that offer better solutions than the bitcoin to face the great challenges of the current economy. But big capitals only seem to have eyes for bitcoin. Maybe the price reaches even much higher levels, but only motivated by mere speculation without real sustenance, and we will continue to see the continued volatility that has been observed, like the classic pump and dump business that bitcoin is now.