My only concerns will be price and availability. Undoubtedly the suppliers would be the ones administering the vaccine, and they would surely pass on any cost incurred. This would drive the price of fish up by quite a bit. Suddenly a $2 fish sells for $10, and there is no way to tell if they actually gave the vaccine to the fish for sale. We all know how trustworthy fish suppliers are.
If the vaccine does however actually make it to the shelves of LFS for customers to buy and administer themselves, this could be a breakthrough, but I would be afraid that the government would step in and make you go to a veterinarian to get it just like you have to go to a vet to get a rabies vaccination for your dog.
I didn't see any mention on how much it would cost though, so the numbers I stated above are purely speculation. If they can make it cheap enough, this would be a great precautionary measure, but it is actually not needed if you use adequate quarantine procedures and good judgment.