One of the reasons there is a hefty faculty turnover every couple of years is because there are a lot of staff that come right out of college. They are young, energtic (able to take the grueling Hyde schedule) and most are able to really connect with the kids.
Usually after three or four years these young faculty members head to grad school, international travel and studies, on to another school where their Hyde expereince helped them get that position.
Some if not many return to Hyde after receiving their MA or leave a traditional prep school missing the intensity of Hyde.
Also with the new leadership in Woodstock, you'll probably see a lot less turn over other than the journey to get an advanced degree.
I left after 4 years and really miss it. I'll probably go back someday.