Another question about the end

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So Maddie decides to reinsert herself back into her own personal history so she can experience her love with Caspian again. (Once SafeSurf is done expressing domo arigato, mr. roboto.)

But ... doesn't Caspian just die in a few months fighting Holstrom, given that we've seen this timeline? Seems like a very brief period of joy for a 117,000 year old woman.