Pretty much its just see how he goes. Obviously it can change at any time. And im asking myself that question every day.

especially when he has a grumpy day, but at the moment he is still social and has more happy playful days than bad ones. He can still navigate his cage without his wings, and is eating healthily.
At the moment his beak and feet (toenails) are healthy, though a little long, and don't seem to bother him at all yet. So , so far it just looks like the virus is affecting his feather growth and immune system. And though by definition his feathers must be irritating, his behaviour and personality has not changed from how he was before he was bald. And he doesn't get scabs or hurt himself or anything, aside from his follicles he leaves his skin alone.
That is why i have to be super vigilant about everything about him. The Vet and I dont think it will actually be a direct result of the PBFD that eventually gets him, but i am afraid he will get some other disease he wont be able to fight, or that he will jump off some high place and seriously injure himself. (im looking at completely redesigning his cage to his climbing needs and making it so he can never fall too far).
(hes still a bird and i cant completely stop the 'taking flight' reflex even though he was never flighted anyway he insists on jumping instead of climbing down sometimes - because its quicker i guess...)
Honestly although we havent reached that stage yet, my vet doesn't have much long term hope for him, (the only experience they have had with PBFD was another bird a few years ago who had to be put down quite young because it displayed acute symptoms, not chronic symptoms like Pickle). and i know that he will not have the same life as other parrots.
They are a great vet even though i only had 3 avian vets to chose from in my state, because they were very good with pickle, didnt dismiss 'unlikely possibilities' like testing for PBFD in the first place (unlike other vets) and was candid with me and listened to my concerns, but it still seems like they have to research some things about Pickle the day before i bring him in > I don't think they have seen to many eclectus. So first hand information from other pet owners is just as important to me as their opinion.