Really, I would view it more as an 'Adoption By Default' scenario. Or, at the very least, that she's a descendant of Trinity's Overbeings much like how Sailor Cosmos was supposed to be her own descendant.
(And on that note, does anyone else see Sailor Cosmos playing a vital role later on down the line?)
It could actually make for a very lovely bit of closure for Usagi's story - that after everything has been said and done, The Three convince her to apprentice under them for a time. The Sol System can govern itself, and the Jyuraians (along with their getting-along-like-a-house-on-fire allies, the Abh) won't be far away when help is needed. Mamoru and Chibi-Usa go with her because they can learn a few things as well.
Without Usagi there to pull them all together, the other Senshi will feel free to pursue their own interests, which will free up Ami to be with Rob while they explore the Metacontinuity.
On another front, we really haven't talked much about Doctor Doofenschmirtz's plot - namely, where he finds a bucket of Handwavium from Fenspace that the Goddesses somehow missed (like Andy and his open boxes of antimatter, that) and decides that he will turn the landmark buildings of the world into space ships.
Why?
Because he's somehow twigged to the fact that aliens are real, and he wants to get a jump on things by opening Earth's first used space ship dealership.
And Perry isn't gonna be around to stop him this time.
Of course, this means that in Season 2 we're obligated to have this bit as well:
"Aren't you a little young to be going out into space?"
"Why yes. Yes we are."
(And on that note, does anyone else see Sailor Cosmos playing a vital role later on down the line?)
It could actually make for a very lovely bit of closure for Usagi's story - that after everything has been said and done, The Three convince her to apprentice under them for a time. The Sol System can govern itself, and the Jyuraians (along with their getting-along-like-a-house-on-fire allies, the Abh) won't be far away when help is needed. Mamoru and Chibi-Usa go with her because they can learn a few things as well.
Without Usagi there to pull them all together, the other Senshi will feel free to pursue their own interests, which will free up Ami to be with Rob while they explore the Metacontinuity.
On another front, we really haven't talked much about Doctor Doofenschmirtz's plot - namely, where he finds a bucket of Handwavium from Fenspace that the Goddesses somehow missed (like Andy and his open boxes of antimatter, that) and decides that he will turn the landmark buildings of the world into space ships.
Why?
Because he's somehow twigged to the fact that aliens are real, and he wants to get a jump on things by opening Earth's first used space ship dealership.
And Perry isn't gonna be around to stop him this time.
Of course, this means that in Season 2 we're obligated to have this bit as well:
"Aren't you a little young to be going out into space?"
"Why yes. Yes we are."