Not keen at all on this.

U.S. dairy farmers get back end subsidies which they would be loathe to dismantle.
Despite this, half the small U.S. dairy farmers are broke or near broke as the ride out the inevitable price cycles.
That's why supply management was introduced in Canada - to allow for price stability and give farmers a fighting chance. Pure capitalism rarely works and this would be devastating to Canadian farmers.
Think of all the deregulation under Reagan and the havoc it caused.