Difficult question , and yes and no. Data analyst will be always required and can be also used in crypto field. Blockchain specialist is in high demand now, because of hyped crypto market . In a year or two situation might change. So you choose whether to take a risk or not, no one is capable to give you a good advice here.
Indeed, data analysts can be working for cryptocurrency too and in fact we have now many ICO projects focusing on the data industry and how to use data for better products/services on the market. On the other hand, there is a strong demand for blockchain specialists even years from now because though Bitcoin can be gone one day it is the blockchain technology that can remain on the scene as it is now adopted by many industries big and small.