But then the sage of Spirit would be kidnapped inside the Spirit Temple for the rest of eternity, because nobody's there on the child timeline who can save her!
Yea...except LINK. His knowledge of the future would allow him to save Nabooru the same way he prevented Ganondorf from taking over.
Timetravel lets you put back the sword before you pull it out. He isn't stuck behind a closed door of time because he's already at the Master Sword, so there would be no reason for the door to be closed.
By your theory's logic, there'd already be THAT time period's Master Sword in the pedestal. It's impossible, get over it, your theory doesn't work. Try again.
But look at the first time you meet Zelda, she's looking at the window gasps, and then faces back towords Link, its the exact same thing she does at the end scene. No wait, you're right, its just a coincendence, she really went back to the castle because it was safe because Link went back in time and never defeated Ganondorf, so Ganondorf is still in control of Hyrule Castle, but its safe anyways.
He didn't take over Hyrule Castle yet, he RAN OFF. Atleast
try and make your theories consistent with the games.
1) A retcon happens when an ongoing fictional continuity suffers changes to original plot details and/or chronologies. The form really doesn't matter.
2) Occam's Razor dictates that the simplest solution is best. Assuming a reference to the ancestors of Link and Zelda refers to known ancestors of Link and Zelda in the same media is far simpler than assuming the reference is to an outside media.
1) And again, we have no reason to assume one took place.
2) Holy shit, is Occam's Razor your stepchild? Because that was one of the biggest abuses of it I've ever seen.
So basically your argument is "he's wrong" and you have nothing to back it up?
It's not "He's wrong", but more "He's not necessarily right."
Darkest point in Hyrulean history and Link being a foreigner both point to a post-flood world as much as a post-ALttP world; in my opinion even moreso.
If you want, but I personally believe any revival of Hyrule is a big cockslap to the entire point of TWW's Aesop.