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The huge error that Eastman made was to keep the same month-names for the other months.The problem is, you'll find, that naming things is an incredibly political act. Agreeing on a new name for anything is a terribly complicated process, and when you're talking about something every single person has a stake in... well, it would have never happened. He tried very skillfully to bypass all that, and basically succeeded.
No, his mistake was to underestimate the clout that religious tradition still had on large sectors of the ruling elites. Even now, when we pride ourself in the "scientificness" and rationality of our societies, we're still enslaved by stories written by agrarian priests at the dawn of civilization -- in many ways, it's worse now because nobody would even entertain proposals as bold as modernizing a system we've been using, almost unchanged, for two millennia, no matter how broken it might be.
