Commenter anat linked to a very nice visual display of the latest sunrise times across the US if Daylight Savings Times becomes the fixed time all year long, as the legislation passed the US Senate decrees. The House of Representative has not agreed as yet.
When I lived in Cleveland, the latest sunrise was at about 8:00am Standard Time. One should bear in mind that it starts getting light about 30 minutes before the official sunrise. So while we had to get up in the dark to get ready, it would be light by the time I left for work and took the children to school.
If DST becomes permanent, Cleveland would end up in the western edge of the 8:30am-9:am band, which means it would be close to 9:00am, so that it would still be dark when I drop the children off at school and get to work at around 8:30am.
The people who live in the darker regions where sunrise is 9:00am or later will have to decide if they should change some things like school times so that children are not going to school in the dark. I suspect that if the change happens, many areas in the three darkest regions of the map will do as some commenters suggest, and that is change school times to nullify the effects of the change change.
I am not sure if work places will also follow suit, though it would be easier for them to make the change. They may be forced to under pressure to accommodate families with children who cannot leave for work before their children go off to school.