Bert wrote:So he is more or less making a prediction.
If this was a future indicative with OU, it would have been a certainty, but now it is something like- You are not likely going to take it-?
I suppose you could call it a prediction. Following Goodwin's remarks, I would say that Achilles is expressing his certain intent with regard to the disposition of his belongings, no matter what the attendant conditions (e.g., who or how many come to take his stuff).
I think the difference here between future and optative (often a bit blurry) is chiefly one of will or intent. Achilles is saying that something will not
happen, and it won't because he will see that it doesn't.
To draw, albeit hesitantly, from a 'real world' example: when Saddam invaded Kuwait, the first president Bush said, "This will not stand." This remark seems to me of a piece with what Achilles says in line 301.