Our country (Canada) hasn't been pushing harder enough for this IMO, considering how greatly we benefitted from NAFTA it should have been our top policy objective for the last couple decades.
Modern countries would rather get lost in decades long mega-deals with 1000 conditions for every political crony connection / special-interest group ever than get an actual real "free trade" deal done.
There are still so many things that are ridiculously expensive in Canada for no rational (long term) benefit to either party assuming it was a real market. When you could drive an hour south to the US and get countless things for 25% cheaper (clothes, shoes, cars, etc) not to mention the lack of access to media (streaming sites) and sports blackout contracts.