I think we've already done in the economic class immigration what you recommend through the ministerial instructions by imposing quotas, especially for the skilled worker category. So half of your question has already been accomplished.
The real issue that I think you're questioning is whether we should impose similar quotas for family class, and I don't know; that's a moral question rather than an economic question whether people believe that having parents come is particularly important. I think for individuals in our society, it is. For recent immigrants, it's very important to have their parents come.
The question we have to ask ourselves as a society is how much we're willing to bear the risk of health care costs associated with those parents and grandparents.