As you know today's world of Technology, Every now and than (to be precise not even a decade time, but less than that) a new innovation of Networking arising and which is certainly replacing old ones.But As you said this bitcoin's block chain Network, some thing better in terms of virtual reality.So according to my analysis Bitcoin will definitely exist after 100 years and not only that people will use it as primary currency too but it will be more pricey then today of course.