Telling him the World - whatever it means by that - can make something anew does not answer his question. But Eren's figured out by this point that trying to press on the matter won't do anything but make him increasingly more frustrated, so he should pursue the answers to other questions. Which is also very frustrating in its own right but does at least seem to be more productive.

"So who are you working with to replace them? Who are you working against?" Then suddenly Eren's expression becomes more intense, and it's easy to see why he'd once been described as having fangs in his eyes when he glares like that. "And what about the Travelers marked by the others? Are you expecting us to fight each other!?"