I believe that blockchain can boost economy, its a breakthrough technology can be apply in different industries. Aside from disrupting the financial system, it will play an important role specially to those undeveloped nations and serve as a solution to their current problems and economic issues.
That's certainly true, mate. However, I believe that the adoption of Blockchain technology worldwide will be quite slow than usual. Not to mention, many people still prefer using physical cash than digital money. After a decade of Bitcoin's inception, there's still a lot to improve within the Blockchain industry as there are scalability bottlenecks and other issues. Governments will continue to secretly test their own Blockchain networks in order to deploy digital currencies in the future. Some countries like Venezuela and China are already working towards launching their own blockchain networks for people to use. Venezuela's own "Petro" coin has been launched some time ago, but it didn't gain enough traction to keep going as intended. Maybe other countries will turn out to become successful in launching their own digital currencies, in order to help drive a cashless economy in the future.
Given that Blockchain technology improves efficiency and reduces costs by a long shot, it could boost our economy within a couple of years from now. Everything will depend on worldwide governments and the people using digital currencies for sure. If everything stays the same even with Blockchain on the lead, then there will be no improvement in our economy whatsoever. All in all, it's hoped that Blockchain technology improves long enough to become a rock-solid solution for the world's economy in the future. Whenever that will trigger a boost or not, it's yet to be seen. Just my thoughts