It is still too early to say if it is going to be improving the world economy as that would be based on adoption on the global level anyway, but I believe like I said already that if this ends up taking shape as imagined, it would definitely have a positive effect on the economy of each country at large that adopts this.
Yes. The movement is slow, but we'll be able to experience a cashless world powered by Blockchain and AI within a few years from now. These technologies will make our world more efficient, as everything would operate in an autonomous way. However, as well as you do, I believe that many jobs will cease to exist as automated machines will start to replace humans in the future. AI will bring complete autonomy over machine's decisions while Blockchain would be responsible of the security and reliability of the global economy.
Of course, we're still in the early days for a complete transformation of our economy to occur, but as said technologies improve every step of the way, we'll experience an economy in a whole new level. The key for accelerating this would be to spread out the internet in areas where it's inaccessible. That way, a movement with Blockchain and AI could happen at a large scale as even third world countries would be able to adopt it.
Nevertheless, we'll see the outcome of this in the future. Just my thoughts