Morris and Lawes were on SC with Jay & Dan this morning and he said that mixed doubles is already quite popular in other parts of the world. There is a pro tour of some sort in the works in Asia and Europe. If that gets going, he said he'd be interested in participating.
Last year's World Championships in Lethbridge had 39 nations competing, including such traditional curling power houses as Australia, New Zealand, Brazil, Turkey, and Israel:
http://www.worldcurling.org/wmdcc2017
Now that it's had Olympic exposure, it will likely gain popularity quite quickly across Canada.
The beer tastes just as good after the game.