Understanding what it is goes a long way in finding your answer. Its a very sensitive subject that you will have a million different points of view on. Primarily do to the fact 90% of the community that supports it dont even fully understand it, thus creating a constant debate from the peanut gallery. With that being said, heres my opinion. Bitcoin was designed to be a currency, if thats all it was it would have failed already, but the technology driving bitcoin is where the real gold mine came. The same technology that made bitcoin could be implemented in many environments and evolve how things work. This benefited bitcoins survival as a currency becouse it could now be used as a means to buy into somthing. In the future its possible that you will be spending bitcoin at your local walmart, but in present day its not widely accepted, so the coins that sprung up due to its new technology is the root cause of bitcoins survival. Giving it a real purpose as a currency. Now with that being said, it boils back down to the fact bitcoin is a technology. And as technology evolves it could possible render the blockchain obsolete, more then likely just evolving the blockchain as well, or replacing. I think the concept is here to stay tho. I suspect worse case we will be buying up our imaginary coins for along time. I dont even see it slowing down for a min of 6 years, but governments will play a large role in what comes next.