I think the Freys are going to get Ramsay after he pretty much put an end to their ambitions in the North this week. I know no one expects Walder Frey to go out of his way to avenge a daughter, but the baby was half Frey and the potential heir to the Warden of the North. I think Roose planned to dispose of Ramsay somewhere down the line and solidify his alliance with the Freys, but that’s all blown to hell now. Walder probably would have let Ramsay just marry another Frey, but now that he’s married to Sansa that’s out.