In her recently published (Hebrew) book, Memory and Oblivion - The Mystery of the Dead Sea Scrolls, she offers a bold and coherent narrative to explain events about which scholars have long held contrary views.Read it all.
The short reason for the canon/Apocrypha divide, she suggests, was a dispute over the calendar. The more profound explanation involves a power struggle between the old priestly order that believed its rulings to be divinely inspired and an emerging class of rabbis espousing a different narrative, one which gave human reason and laws a role in shaping the religion. Elior demonstrates how mystic notions like cosmic calendars and heavenly chariots were part of a power struggle whose outcome would affect how Judaism is practiced to the present day.
For centuries the Israelites had marked time according to a solar calendar drawn up by the priestly caste but regarded as divinely inspired. The calendar emulated the pattern set by God when He created the world in six days and rested on the seventh. The number seven would become a mystic measure of Jewish time. The Israelites adopted a seven-day week, apparently the first people in the world to do so, and they too rested on the seventh day.
[...]
In a game-changing move, the rabbis declared that the age of prophecy had long since ended and that the priesthood had been severed from ongoing access to higher authority. According to one rabbinic tradition, prophecy had ended with the destruction of the First Temple in the sixth century BCE. According to another, it ended when Alexander the Great and the Hellenizers arrived two centuries later. The priests vigorously rejected this downsizing.
The rabbis favored a lunar calendar, says Elior, because they saw it symbolically freeing the nation from dependence on a closed priestly caste locked into the solar calendar and claiming divine authority. They wanted to symbolize instead man's share in the determination of time and of his own fate. "They declared that human understanding of sacred writings was a legitimate source of authority." The month would now not commence according to a solar calendar precalculated for eternity but by mortals scanning the sky for the new moon, perhaps disagreeing about the sighting among themselves, perhaps even erring.
Background here.
UPDATE (11 May): Bad link now corrected. Sorry.