I don't think the point is that they could buy houses and live a middle class lifestyle. If you compare the two absolute circumstances: 1. Not having enough calories, and literally being pained by hunger, and the associated near-term consequences thereof. 2. Having too many calories in not the right proportions, which have longer-term consequences.

I would expect that people in both circumstances #1 and #2 would prefer for #2 to happen to them. Just because things aren't perfect, doesn't mean they aren't better than they were.

If you look at things as absolutes (as opposed to comparing "poor" people to the middle or upper class), then you can fairly assert that the kind of poverty that was more common in the US in the past and is still common in the developing world is, for the most part, solved.