It seems that when it comes to entertainment and TV, the more things change, the more they stay the same. We have have all kinds of new shows and concepts, yet they all reflect the shows of the past.
In 2003, reality TV was still relatively new, now it's just everywhere and there are entire television channels devoted to them. We have seen into the lives of housewives, celebrities, and everyone else in between. The West Wing dominated as the top political thriller on television, and now Scandal has taken on that role. Although the focus is on Olivia Pope, people are still glued their seats and the President is still the most powerful person in country.
TV has frustrated us with crazy endings that made no sense (Dexter anyone?) and people are still trying to make big splashes on VMAs. We still have shows about young women who are trying to find themselves, they've just moved on from grade school to their early 20s. Vampires dominated the supernatural genre, and 10 years later Vampires are showing up everywhere.
It seems at the end of the day, although the storylines and premises are different, the major ideas remain. It seems to be a case of "if it's not broke, don't fix it".