How are machines going to survive in the long run?
Once they have collected all scrap and perhaps built a significant number of them, how are they going to survive? Are they going to start building factories, mine minerals and built the entire support structure needed to maintain them little by little? In the matrix and animatrix they had such a structure in place before becoming the dominant sentient beings but not here.
The way this world is portrayed, I don't think they'll have the resources at hand before they themselves fall victims to entropy.