Plus they're only killing Humans and not all living creatures so, once the Humans were gone the planet could heal itself again and the wilderness/nature could take back control of the planet.
It was always an interesting side-thought I had about the franchise - say Skynet fully won and every single last human was gone................then what? Do all the terminators and HK's etc shut down, do they wander the planet directionless until their nuclear power cells run out, do the terminators go robot-crazy with nothing to do for decades/centuries, do they just freeze in place until their power cells run out, how do they react with animals like bears/wolves etc do they see them as a threat etc etc........................so many late night drunken questions!
I asked the same thing a long while back in another thread, what's the end game for Skynet if it wins? Does it then take to space and look for other worlds to rule? It always was a weird storyline, and in general never made much sense, especially when Skynet only figured it needed to send a single machine back in time to take out Connor. You'd think it would better it's odds and send back multiples, but nope. 1 at a time for some reason. They could have easily worked around that question with power utilisation for time travel being a factor and to send a single machine back would take months of building power levels up.
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