> most people prefer the non-supply managed products,
taking into account the pros/cons.
I don't think they pros/cons they listed (i.e. price differences) are reflective of reality. Specifically, they list milk as $2.25/L, citing statscan as a source. This is $9 per 4L bag, an absurd price outside of the Territories. Reviewing the actual statscan data source [1], milk prices have been very stable at $1.25 to $1.37 per liter as long as they're been recording data. So I don't know where $2.25 came from. The second source they listed is crowdsourced and refers to milk costs as $0.62 per 0.25L which might be accurate if you're buying a 250ml or 500ml carton with your lunch ... but not if you're buying a larger quantity to take home (and to make useful economic comparisons with).
> only ~40% "support" it, so concluding that "most of us are very happy to support supply management" is a stretch.
That's firmly in Majority territory when it comes to Canadian politics :). There's a reason even the conservative party (the only political affiliation with more people opposed to supply management than supporting it) will not touch the issue.
The most interesting data in that study was the age-based breakdown - younger respondents were much more likely to support supply management, apparently.
[1] https://www150.statcan.gc.ca/t1/tbl1/en/tv.action?pid=181000...