Actually people often say about EII not changing the House of Windsor to the House of Mountbatten or whatever but it only changes when Philip's son Charles accedes the throne. For instance, Queen Victoria did not become a member to the House of Saxe-Coburg and Gotha when she married Prince Albert, she remained a member of the House of Hanover and was their last monarch. It was her son Edward VII who was the first monarch of the House of Saxe-Coburg and Gotha. Do you see, or am I talking nonsense? lol! Therefor I believe that Princess Victoria will be the last monarch of the House of Bernadotte and when her child succeeds her, the ruling house will be the one of Victoria's husband. Seen as it is unlikely that she will marry a royal I would say the most likely thing to happen will be that either the child will carry on the House of Bernadotte regardless of protocol (like the Windsors say they will when Charles should actually be the first monarch of the House of Shleswig-Holstein-Glucksborg-Sonderberg - his father Philip's royal House) or rename the House of Bernadotte in honour of their father - like renaming Windsor to Mountbatten. But who knows what will happen, eh? Hope I helped!