When I was a teen, on weekends with no where to be, I'd regularly sleep until noon, 1pm, sometimes 2pm or later. Should we push school back until, say, 4pm through 10pm-12am? Doubtful that's good either.
On some level, it teaches kids that they have to be someplace at a certain time, regardless of what they might want... You know, obligations and responsibility.
Did you read the article? They have done several studies to show a significance difference in academic performance with a slight shift. That's the whole reason for this change.
"One three-year study (pdf, p.1) of 9,000 high-school students across three states, for example, found that academic performance, “including grades earned in core subject areas of math, English, science and social studies, plus performance on state and national achievement tests, attendance rates and reduced tardiness show significantly positive improvement with the later start times of 8:35 AM or later.”
I can be skeptical this will have any real impact, despite the findings of one survey-study.
The cited study was a survey students voluntarily completed... which opens the door for response bias. The study was only conducted over a single school year, and no two schools had the same modified schedule. Nor did they repeat the study for a second school year to ensure they didn't observe anomalies, nor go back to the old schedule to see if a simple schedule change - not the late start time - is what prompted the changes. Nor did they follow students through their student career, maintaining the altered schedule to see if performance results were consistent.
The 9,000 students might sound impressive - but this is not actually a good long term study... far from it.