Python 3.0 was released in 2008, the fact that 14 years later 2.7 is still widely available (and often the default python, e.g. in my openSUSE Tumbleweed system here) means that the "buzz" was more than warranted.
Also of course things would migrate, it isn't like there was any choice on that matter (and projects like Tauthon that tried to provide a choice had several "Pythonistas" attacking it).
