I don't believe we've had even one decade of that yet. I can only speak to my experiences as a teacher in Oklahoma, but there is a huge disparity in the quality of facilities, technology, teacher quality, materials, etc... between some school districts. I currently teach at a district that ranks near the top in average income in the state as far as the people who live in-district. They have great booster support and several bonds have been passed the last few years and they have amazing facilities, fantastic access to technology, great extra-curricular activities and support, and logically good teachers flock there (at least the ones that haven't fled the state).
My first teaching job was in a place the exact opposite. There was constant turnover at these schools and students at these schools did not have equal educational opportunities, in my opinion.
Even when I was at OSU, we had to log 48 hours of observation of classroom instruction at an 'urban' schools and also had rural schools. I spent time at a total of 4 districts. OKC, Pawnee, Mid-Del and Mulhall-Orlando. Two were awesome and two were certainly not, even though there wasn't much geographical distance between (IMO) the good and sub-par districts.