While tariffs are negotiated down non tariff barriers are on the rise. Even though there has been sifnificant attempts from GATT/WTO to liveralise world trade.

Are we wasting our time trying to get rid of tariffs when other trade barriers are put up in their place?

Don't worry, Free Trade areas won't last long once peak oil starts to bight.
The cost of international trade and even long distance trade within
Australia will get too expensive compared to local trade.