As he’s pretty much stuck to the rest of his election promises he gonna stick with this one. Like the issue of Quebec nationhood, I think it’s a moot point. The motion will be voted against by pretty much everyone in the other parties as well as other Conservatives like Jim Prentice who’ve voted for same-sex marriage in the past and that will be that.
Part of me thinks (or rather hopes) that this is a strategic move by Harper to appease the rest of the Conservative party by going, “Hey, I tried” and then moving on to more important matters. The downside being that it might polarize voters and further the stereotype that all people who vote Conservative are Alberta cowboys which in a lot of cases they are not.