Yes we had a blind piglet earlier this year, he was so successful i didn't realise for weeks!
I was concerned but my vet partner said if he's made it this far he could be fine and the abattoir would have no reason to reject him. Anyway, when it came to (late) weaning I'd forgotten and only occurred to me later that day that he must have got better!
Not saying yours will recover but if he can feed and find water he might do fine