Actually, it would be difficult but not hard. It would be expensive but relatively cheap versus the trillions spent in the last 18 months. So we could certainly do it, but you are correct, we won't. Basically because we don't care.
Its a bit like climate change, and obviously I'm going on a complete tangent here. My prediction is that in 20 years or so, our children will hate us because we knew but did nothing, relatively speaking. In 40 years or so, our grandchildren will despise us. We won't be the greatest generation, we'll be the polar opposite. We have some difficult but doable choices. They will have no choice. Sad really, probably best not to dwell on it.