Perhaps I could just point to the draft legislation. There's a review provision in the legislation that speaks a little bit to what you mentioned. The legislation provides for StatsCan to determine when a review must be conducted. It's proposed subsection 7(2), if you're looking for it.
It's supposed to be reviewed on a regular basis, as determined by Statistics Canada, to ensure that the basket, as it exists, is allowing for people to have a reasonable basket of services and goods that allows them to meet a modest standard of living.