Personally I would like to see freedom of movement in trade agreements. Goods and capital can already flow freely - letting labor do so as well would be more free and have potential to make the workforce something competed for more as well. Companies can already outsource so letting people flow with less artificial resistance (as opposed to natural like language and cultural barriers) seems both fair and efficient.

Granted I acknowledge that has potential to be messy in reality without a whole lot of work to get a framework - let alone one that would be accepted. Perhaps some sort of "social service fee" minimum for benefits in taxes paid to prevent free rider issues for instance.