Interesting topic- I'll do a quick reply due to time limit.

"Not sure if I want to see a total ban, but I’d like to see junk food marketers not directly targeting kids who are too young to understand what is being done to them "

I agree.
If, as a first step, Mcdonalds, hungry Jacks etc would stop bribing kids with toys it would help.

These toys often come out as a series of 4 or six.
If a parent 'gives in' to buy a so-called "happy meal" because the kid aches for the toy, many parents feel pressured into keep buying these happy meals every week so the child won't miss out on a toy in the series.
I've been there once or twice- it's an aweful situation.
I thought of robbing mcdonalds of their toys and handing them out with my plates of spinach or cauliflower.
Can you imagine the headline: "Mother Robs Mcdonalds of Happy Toys".