If cheetahs were to die out hyenas would rule the Savanna. Then giraffes, zebras, and antelopes would all die out. The Savanna would be made up of hyenas. The hyenas would just eat them all. The Savanna would just never be the same.
If a flood ever occurred in the Savanna then the cheetahs living there would have to move. Where would they go? The desert! They would have to be able to survive with little water. They would not be surrounded by grass so they would have to learn how to sneak up on their pray. They would have to learn these adaptations to survive.