Well it depends really.
Templestowe College has different start times and end times, so maybe an experiment should be conducted for this debate.
But if we look at this from the "science" side: Yes, times should be changed. It is a biologically fact that teenagers have a change in sleep times due to the delayed onset of Melatonin that triggers the body its time to sleep.
This Ted talk and the reading list has a strong starting point on this debate.
We know that sleep has
both beneficial effects for us when properly enforced and negative effects for us when
not properly enforced.
However, I do feel that teenagers do have a responsibility to sleep properly as well. I mean seriously looking at your phones in your bed, having inconsistent times going to sleep and waking up
doesn't help you start the day well at all. I also agree with Aaron that in life not everything goes your way. You do have to get up at 5:30am to get work on time that starts at 8:00am.
It also depends because schools have different start times and end times as well. My highschool had a start of 9:00am and finished at 3:15am. That suited most of us and those that wanted it changed were notorious for partying on the weekend well into 5:00am.
You can see how that didn't help their case. But also sometimes some people do have a long commute to get for school as well.
So in the end, should they change? Honestly, I would say no in the end. But there are strong arguments for both sides of this debate.