Çatalhöyük existed for a little over 1,100 years from 7,500 BCE until 6,400 BCE. In the lower levels of the city there is scant evidence that they had any knowledge of agriculture or the domestication of animals though such evidence exists in the more recent upper areas of the city. This would suggest that agriculture and animal domestication is not required for civilization as we once thought.
It could be that in some areas there was no choice but to switch to agriculture. Human beings got quite good at hunting, and combined with climate change or other pressures the it may have been increasingly difficult to sustain a large population via hunting.