Surrogacy, perhaps, since Alicia can't have a child of her own? That's a topic that could raise debate. It could also bring great heartbreak, should anything go wrong. And I do remember reading somewhere that a future storyline for Alicia could produce some heartbreak.
I certainly wouldn't want it to be something that would rock their marriage though. Only something that could make them stronger. Great drama yet encouraging for those who in real life face great obstacles yet go through it together and come out stronger in the end. Would be nice to see a few more of those kinds of storylines every so often.