Wilson, 65, known as the Beast of Blenheim, has served 18 years of a 21-year sentence for sexual offending against women and girls including rape, indecent assault, stupefying, wilful ill-treatment of a child and bestiality.
He has served the maximum time and can no longer be kept in jail.
He is set to be let out on parole with unprecedented strict conditions within the next three weeks and will live in a house on the grounds of Whanganui Prison.
Among his conditions are GPS tracking, no internet access and strict rules around his interaction with other people.
His lawyer, Andrew McKenzie, has said Wilson will challenge the legality of the conditions because they amount to unjustifiable house arrest.
However, the man who helped put Wilson behind bars in 1996, retired detective Colin McKay, told Radio New Zealand today the tough conditions might not be enough.
"If the experts believe he could reoffend there's a high probability that he might . . . one never knows with people with his attitude. It's a problem that the public must face that there's a possibility that he may reoffend," he said
But Mr McKay said he hoped the public would feel safe with the tough release conditions.
"Once he's at large and could in fact disappear on them - there's always that risk factor on anybody who has been released - but it sound to me like they have imposed some very sensible and stringent conditions."
Wilson's former girlfriend Lois Lenaghan said his living conditions might put him in danger.
"I reckon the crew down in Wanganui will get to him, the inmates down there - if they can get near him they'll finish him off," she told RNZ.
She said he should never have been let out of prison.
Wanganui district councillors Michael Laws and Ray Stevens have called a community meeting for this weekend.
Wanganui was chosen as Wilson's place of residence primarily because it was one of the few places in the country where none of his victims lived.
Mr Stevens said the public meeting on Sunday was a chance for the public to give feedback on the decision to house Wilson near Wanganui.
"The public of Wanganui are urged to attend this important meeting to relay your message loud and clear our expectations of maintaining a family friendly community that we can all feel safe in."
