I think we will see a large influx of poor rural people, which will end up as industrial workers, I suspect their children will mostly adopt Swedish, but as the influx continue to modern say, new Finnish speakers will keep arriving and the last arrival will be more likely to keep their language. So I think a Finnish speaking population of 25-30% would be likely by modern day and likely slightly rising with the city being split in a Finnish speaking north and a Swedish speaking south and east.
I see we are looking at the development differently. I'd assume that if there is a large influx of rural people, it would be mostly from Finnish-speaking areas (that is, after all, mostly what Finland is made of, IOTL and ITTL), and that most of those people would keep their original language (significant social ascent not being likely for most, and Swedish was predominately needed for gaining an access to the state bureacracy, the clergy, the middle classes or intelligentsia, not merely to be industrial workers or foremen, etc). As the Finnish-speaking community was already an established part of the city, I'd expect that the Finnish-speaking community would never drop below 30% and would gradually grow since the mid-19th century, reaching 50-70% by 2017 - as opposed to the OTL, where Turku is 90% Finnish-speaking by 2017.
In other words, Turku has Swedish-speakers roughly in proportion to how much they make of the national population. It would be realistic that the city would reflect the general demographics of the Eastern provinces ITTL as well, with a certain local overrepresentation of Swedish-speakers due to state bureaucracy, etc. So - 30-50% Swedish-speakers by the modern day, at the most.
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