Well, champagne- yes and no. He will never be allowed to be a teacher again, nor work with children or vulnerable adults, because it is judges their right to be protected from the threat he may pose trumps his rights to "make it better". That's the way things are, because ultimately when you have to conflicting needs (the right to be safeguarded vs the right to rehabilitation/2nd chance) then one always has to be put first and those are the needs of the child/vulnerable adult. It's safer not to take that risk.
I understand your point, but there are some things that just can't be "made right" and everything return back to normal. And I do seriously question whether ones sexual preferences can be altered by a prison sentence and some therapy.
This man, a teacher of young children, got off on watching children sexually assaulted and raped, even if he didn't actually do the abuse physically. He may or may not ever have intended to moved onto actually physically harm a child personally. I dot think n't he helped feed the truly evil "industry" of child pornography. This was not a victimless crime or "just looking at some horrible photo's".
If taking this stance, pushes him, or others like him into re-offending as he has nothing to lose, then they were never rehabilitated in the first place.