The eldest son of Sahure - Netjerirenre didn't became the ruler of Egypt after Sahure's death (he wasn't an adult at that time, which wasn't a problem later, when regents ruled instead of underage rulers - e.g. Hatshepsut and Thutmose III). It was Neferirkare, who came to the throne - probably Sahure's brother.
Neferirkare also let build himself a pyramid in Abusir, but it was finished by his successor. Against his tombs Neferirkare let build and finished the biggest of Sun temples, which wasn't found yet as well.
Influence and power of the Pharaoh declined at his period, it was slowly weakened by a strong state bureaucratic apparatus and the priests.
Pyramid of Neferirkare