Hmm... You've done a lot of thinking on this.
The problem is that we have very little to go on, at this point in time. We know that the moon is falling, and we know that Hinata is in "The Last." We also know that Naruto is in it (as well as Sasuke, Sakura, etc).
Beyond that, we really don't know too much.
I still contend that Hagoromo is what Buddhists refer to as Gedo - misguided, heretical. Therefor, his actions will ultimately turn out to be destructive and his influence regarded as negative even if his intentions are good.
We also know very little about the time of and before Kaguya. While she had the Byakugan prior to consuming the fruit - did -she- have chakra? Hagoromo was regarded by Madara as being the first human to be born with chakra - but when Naruto asked if Hagoromo was an alien, the question was avoided.
This implies that there is something about Kaguya that distinguishes her from 'human.'
Within Taoism, there is what is known as the Mystic Female:
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""The Valley Spirit never dies.
It is named the Mysterious Female.
And the Doorway of the Mysterious Female
is the base from which Heaven and Earth sprang.
It is there within us all the while;
Draw upon it as you will, it never runs dry."
Tao Te Ching 6
(World Scripture, International Religious Foundation, Paragon House Publishing, 1995 p. 95.)
- See more at: http://www.adishakti.org/_/tao_te_ching_doorway_of_the_mysterious_female_is_there_within_us_all_the_while.htm#sthash.tq4MGGSq.dpuf"
The Mystic Female is the 'portal' through which the universe springs to life - through which Taiji and Wuiji pass to produce the cycling of Yin and Yang - which produces the Four Movements that in turn produce the Eight Trigrams (Bagua).
Taoism tends to hold women in reverence, particularly mothers and the relationship of mother/child.
The moon, within Taoism, represents the cycling of yin and yang.
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The moon is often used in Taoism as a symbol for the cycling of Yin and Yang. It is the cycling of Yin and Yang that gives rise to what is commonly referred to as the mundane world (the world we experience and consider physical).
It is possible that the moon crashing symbolizes an interruption of the cycle - if this is the case, it would reinforce one of my earlier suspicions that the fruit must be consumed.
Within Chinese and Japanese mythology - there exists the Lunar Rabbit, as well as the princess of the moon, Kaguya (more of a Japanese legend).
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- The Tale of the Bamboo Cutter - which introduces Lady Kaguya.
Honestly - it's stories like that scattered throughout history that make you wonder about the "ancient aliens" stuff.
Then you have the Lunar Rabbit:
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It is quite possible that by imprisoning Kaguya, the natural cycle of Yin and Yang through the Mystic Female has been halted and this will result in the world ceasing to exist (or just pandemonium that is convenient for a plot).
It's really hard to say, though, what Kishimoto will do - or what the anime writing team will suggest to him (or do with his approval).
What you've observed/reasoned may come into play, as well (and may be closer to how things will work than any of my musings over ancient stories and philosophies).