I, for one, would feel lost. I love and appreciate the moon very much and rely on its energy for comfort, healing, renewal, cleansing, empowerment and solace, just to name a few. Not to mention its amazing beauty. It is lovely to sit and bask in the moon's glow and soak up its energy, just like the importance of getting the sun's healing and cleansing, etc. benefits. For me, the moon is equally beneficial and important so therefore I can't imagine not having it there for us all to enjoy and benefit from.
As for astrology, tides, and weather patterns, oh my! What a mess we and our world would be! I think that people often think less of the importance of the moon and the role that it plays in our world. What would our planet be without our tides, etc.? I can hardly begin to think of the disaster our world would become!
Good question here, thanks for getting me thinking :)