TamerVirus is right in that lack of women in the workforce did not primarily cause the slump, but kept it that way.
Abenomics (which to me as a non-expert seem to be mainly strong stimulation by quantitative easing, increased government spending and similar means) have not really succeeded. Bringing more women into the workforce did not seem a primary part of this. I would be grateful if someone more informed told me of any efforts to bring more women into work; I heard of some, but not exactly what they are.
Reelya: That engine design sounds...unusual. Turning vacuum into energy, particles or anything really is not something I have ever heard of before, or think is vaguely possible even in theoretical physics (violates conservation of just about everything). I am acquainted with the Alcubierre warp drive, but that warps space around the craft and does not turn it into anything else. Theoretical warp drives do not have the craft "riding" anything; space warps around the craft, hence the name. The craft is not actually accelerating at all. This avoids lethal acceleration on board the craft, and also avoids anything having to go faster than light; nothing can go faster than light, so the only thing going faster than light is...nothing.
Personally I would prefer for "science" fiction to just be recognised as the fantasy that it is and for all bullshit science to be described as the magic that it is. Magic is magic, however many big words it is wrapped in.