Can you detail the specific signs of societal decline mentioned in Chapter 4 that precipitate a saint's arrival?

Certainly. Chapter 4 of the Shri Sai Satcharitra lists several specific signs of a world in spiritual crisis. These include a breakdown of the social order, where Brahmins despise their stage of life and Shudras attempt to become Brahmins. It also mentions a widespread lack of respect, where religious teachers are insulted and people compete with one another instead of showing deference. Furthermore, the chapter notes a decay in personal conduct, with people ignoring rules about what to eat or drink, and even Brahmins openly consuming liquor and meat. When religious people themselves grow tired of their daily prayers and rituals, it signals the time for a saint's incarnation.