Japan has no natural resources to speak of. Other than it's people of course. They have survived worse and they recovered. They will recover from this. What is deemed most important will be done first naturally.
In the big scheme of things binoculars are small. This might be advantageous in them making a relatively quick comeback. Judging from what we have seen in this forum making binoculars seems to be a sophisticated kind of cottage industry. Even with the ones made in Europe. Think of how many were made for WW II and how quickly they were made.
Meanwhile there are bigger worries in the world.