you have totally deflected the question, the question is not about japs' will.
Actually, it is about will. Because the absolute full capability of any country is unknown, it depends on their situation. Imagine if the world is under attack by aliens whom everyone on earth start to realize that wants nothing but annihilate the human race, countries in the world will act very very differently from how they act right now.
For example, can the Japanese not develop an stealth fighter, if their very existence depends on it? I believe of course they can, because if such situation happens, the entire nation will go into a state that could be very different from what they are right now. They could turn into a total work-to-death totalitarian structure. They could forfeit all material comfort and put all resources into military, all but necessary sustenance.
But, right now, they have been working on a stealth fighter for 2 decades now, yet haven't produced much results. This does not mean that the current Japanese teams, government, industry, or the people are half-hearted about their efforts. It's just that they are simple not as driven to produce the that result, because they don't really feel a dire need. That can all change, let say, if a god appears and say to them: "produce one now, I will come back every month to see if you guys have produced one, and every time you don't have one, I kill 500,000 people."
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