Maybe I misinterpreted what you meant. Your quote from the CDC said that the virus has poor survivability on surfaces, but the study I linked concluded it can survive for 2-3 days.
Any method of transmission that infects fewer than one additional person on average are effectively negligible on the overall exponential curve.
So yes, it is likely possible that symptomatic people can infect others, and it is likely possible that a contaminated doorknob can infect people for a week, but if these things happen rarely enough, it doesn't matter. The virus will die out if other routes of infection (e.g. the more typical person to person transmission) can also be made rare enough.
I apologize if this is coming off as pedantic but the damage being done by misinformation and speculation about the coronavirus is significant, and I don't think it's possible to be too zealous about precision here. Trump's claims that fears were overblown and a "hoax" have been amplified into widespread and potentially deadly skepticism that coronavirus is even a danger. People have suggested various quack cures that at best drain the resources of vulnerable people. Even saying something as seemingly-innocuous as "wear a face mask to reduce your risk" ends up having a devastating impact on healthcare providers who really need the masks but can't source them. We should be listening to public health authorities and mainstream health experts, and taking reasonable precautions, but absolutely refraining from speculation that might have unforeseeable consequences.