That's a good question. I will clarify.
Currently, the Old Age Security Act prevents the payments of the guaranteed income supplement and the allowances for a sponsored immigrant. However, that restriction stops after 10 years. Once the immigrant has been in Canada for 10 years, it doesn't matter if they are still sponsored or not; they become entitled to those benefits. That was okay before the changes were made by Citizenship and Immigration on January 1, because the longest sponsorship period was for the parents and grandparents category, which was 10 years.
Now that it becomes 20 years, it would not make sense to leave our provisions the way they are, because you would end up having individuals being in Canada for more than 10 years and still being under a sponsorship agreement. They would still have someone responsible for them financially and collecting guaranteed income supplement benefits, which are supposed to be based on need and targeted to those most in need.