My neighbors and I were just talking about this. When Dublin closed the 'America's Best' Hotel (Granted, for some understandable health and crime reasons) a block from us, many of the near-poverty / unemployed people staying there were pretty much left of the street.
We still see some of them walking around but have no clue where they're staying. It's definitely visible here if you look for it and has become more visible since the recession hit.
Now, this is not to say the city is headed the way of French suburbs, but I'm certainly not surprised by suburban poverty. I think Dublin is likely home to more 'material poverty' where people over-extended themselves to have a lifestyle they simply can't afford. Now, you have these half empty or 1/4 completed new neighborhoods in the northern, annexed, upscale areas that I have no clue what will happen to.
It will be interesting to see what happens over the next decade as we will see changes in energy costs, school funding, transportation technology and efficiency, governmental restructuring and resource sharing, the economy, and cultural shifts like latter-gen xer's and gen yer's starting families. All of those things will impact this stuff and it's pretty tough to say exactly how. Knowing what we know now, cities or denser areas are looking pretty good.