IDK Lithose, I like to look at the TV show through the lens of your average TV watcher (even myself, who read the books wouldn't immediately remember characters in the show introduced for one episode 4 or 5 seasons ago). I like to think that the impact of such a thing would need to be somewhat relevant.
Because of this, I almost don't like that they would just go, "SURPRISE!" Using the new character as a means to further this particular story arc. But it could also be a good setup if they execute it properly. Maybe even a little expose from Smalljon about the Starks serving the North honorably for thousands of years. Even though Ramsay is legitimized, I think that him being a bastard would be to the serious chagrin of some of the Houses.
Because of this, I almost don't like that they would just go, "SURPRISE!" Using the new character as a means to further this particular story arc. But it could also be a good setup if they execute it properly. Maybe even a little expose from Smalljon about the Starks serving the North honorably for thousands of years. Even though Ramsay is legitimized, I think that him being a bastard would be to the serious chagrin of some of the Houses.