This actually would bring total transparency during an election. But do you think people are ready? Do you think they will understand the technology required for voting? Are they actually ready or will end up hesitating to vote? Too many questions, one answer: They will need to be educated about the technology before these are implemented.
Well for Japan its a yes, they are always open for innovative ways to improve their daily lives and that is what I admire them the most. They are not afraid to try new ideas and they just test them out just like what is stated by OP. People can now thrust blockchain in election because of this move by the Japanese People.