Well, in that note he says:
So waddayathink? Do we have to take this note word for word? In other words, had Covenant failed, would the real world have been truly destroyed? Or is it just that he would've died in the real world, which he did in the end anyway?If he is defeated, he will die, and his world - the real world - will be destroyed, because it lacks the inner strength to survive.
How deep goes the connection between our world and the Land?