My recommendation is, certainly, to modify the closed nature of the program. If the workers are able to choose their employers at their own will, that reduces the instances of abuse and exploitation.
More importantly, whether it's closed or not, employers have to comply with the relevant legal obligations. I accept that a large number of employers already do. It's those others who do not who require further attention from the provincial and federal governments to see whether they can take appropriate law enforcement actions against those who breach labour standards legislation.