>>96571656
>the outcome of war to be worse than accepting the loss.
The outcome would be victory and eradication of the Eldar but they'd have to look for a new Galaxy and that's what The Silent King did. He went on to search for a new Galaxy. We don't know what he found but he's hell bent on ascend ding his people to C'Tan like beings rather than getting their bodies back. I don't think anything good is beyond our Galaxy in 40k.

In the end Orks were a nothingburger and Eldar were too weak without their masters The Old Ones (who got exterminated) to wake up Necrons and destroy them. They didn't even attempt to wake them up out of fear.