Honestly I see Finnish going the same way as Gaelic did in Canada or German in USA. Yes Finns will likely be overrepresented, but they're unlikey to make up a majority, Sweden had plenty of Swedish speakers, and when we reach the era of mass migration a Swedish St. Lawrence will be the main migration destination of Danes and Norwegian, and they will assimilate into the Swedish speaking population. The German Lutherans who will also see St. Lawrence as their main destination are also far more likely to adopt Swedish over Finnish.