If he is steady state that is better than deterioration. If he was only getting worse after the plasma I'd suggest letting him go.
Poodles are determined little guys and nursing might pull him through.
The best person to give you odds is the vet treating him.
You can read about parvo here
www.marvistavet.com/html/canine_parvovirus.html
and it gives treatment suggestions which might give him more of a chance.
Hope this helps you and that the little guy makes it!
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