It may take a while, but I feel sure that this precedent will eventually be used to get polygamy/polyandry/polyamory and/or other forms of multiple-marriage legalized.
There's simply no good reason to deny people the right to form the kind of family they want, once you've kicked over the traditional definition.
Yeah, I know, it's more complicated. That doesn't justify denying these people their rights under our current rationale on such things.
Yeah, I know, some existing examples of polygamy are viewed as abusive or coercive (ie splinter Mormon extremists). That's no reason to deny poly-marriage to those adults who voluntarily choose it, many of whom may not be religiously motivated at all.... the majority of the poly-marriage people I've known (who live that way without legal endorsement at this time) were neither Mormon nor particularly religious otherwise.
It may take a while but it will be legal one day, and it won't be too long before the first movements in that direction begin.