Becoming part of the witness - imagine having to share your mind with all those other people trapped in his head.. and isnt their whole goal to calcify everything anyway? I’d rather float between realms than be turned into a dust statue.
Becoming part of the witness is arguably the least terrible option on this list because all the other options strip you of everything but at least in the witness you get to exist to an extent. Being converted into Dread is arguably the worst option.