The ending
He was cured alright
No really, he was. Earlier in the movie, we see him listening to some Beethoven. While he "slooshies" he's fantasizing about women being hanged, explosions, himself as a vampire, violent stuff.
At the end, we see him doing his little slooshy thing again, and now he's fantasizing about consensual sex with a woman who seems to be enjoying herself, while a group of people watch and cheer the event.
He's not "normal" still, but his violent urges have ceased to be. Don't know if this is by his own maturity, or by the "doctors playing around with me guliver" but there we have it.