To be completely honest, euthanizing your animal is completely your call. Nobody can tell you when to have an animal put down.
Whether or not you choose to go with it, what I would say is move the snake to a small enclosure or a tub so it can feel a little more secure. Keep the enclosure dark and keep your husbandry as spot on as you can. 80F cool side, 90F hot. Keep the humidity elevated too, because it will help break up the mucous which might make it a little easier on the snake.
This is just my opinion, but I would wait and see if the treatment he is on right now will help when it is done, and then decide. But that's just what I would do, this is your animal.
Whatever you choose to do, I've got my fingers crossed for your little guy. Good luck with him.
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