Triforce of the Gods Manual - Proper English Translation

On a side note, the SR would instantly turn evil/good based on the person who enters it. It has nothing to do with the triforce, which itself alone determines whether this evil/good person has the balance.

Here's where I disagree with you.
The transformation of the Sacred Realm is corellated to the Triforce. Otherwise, why doesn't the Dark World instantly turn Sacred again when Link enters it in aLttP? In fact, it doesn't even turn Sacred again when you kill Ganon. The Triforce tells you it will vanish [future tense], and then you touch the Triforce. It stayed evil until Link touches the Triforce, just as it stays good until Ganon touches the Triforce.

Woops I took out the part where I said it is open for interpretation. It is true it doesn't visibly instantly change in the games. The wish/triforce does it.

The resting place of the sacred
triangle, the Sacred Realm, is a
mirror that reflects what is
in the heart...
the heart of one who enters it...
If an evil heart, the Realm will
become full of evil; if pure,
the Realm will become a paradise.

This quote is indirect. In reality it means the SR will change depending on who gets the Triforce, and it assumes that whoever enters the SR will in fact get it. The Triforce is what alters the Realm. In ALTTP, Ganon's wish altered it, not just the touching of the Triforce without a thought or anything like that. I think when people are about to touch the triforce, they already have their mind made up on what their wish is. This is shown to be true in ALTTP, though it is not directly stated in OoT.

In OoT, If G made a wish, it was most likely to conquer the world, which is Hyrule.

I am Ganondorf!
And soon, I will rule the world!

They say that Ganondorf is not
satisfied with ruling only the
Gerudo and aims to conquer all
of Hyrule!

According to Zelda, G got the Triforce and then invaded the SR. Did the SR change instantly once G got the Triforce in OoT though? It's possible, seeing as how this happened in ALTTP. Invading the SR could mean removing the undesirables who remain in the now evil SR. They were there when it was good and they were there when it became evil, so G wanted to get rid of them.