The end of the film is built on a message of enduring hope: Luke's sacrifice isn't just a means to help the rebels escape, it's also the foundation for his mythology to be built even further to help capture the imaginations and hearts of a new generation of rebels.
And we see that in direct action, as the stable children that Rose and Finn help on Canto Bight immediately mythologise the Battle Of Crait and use it as inspiration for their own mini rebellion. We were supposed to use that scene to extrapolate the fact that others would follow suit, but the biggest thing to come out of it was actually the reveal of one of the kids having Force powers.
In essence, that confirms that there are new potential Jedi out there, who could follow in Rey's footsteps and that there is cause for hope for the Resistance that they could once more have Force-users on their side beyond just Rey, Maz and Leia.
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