I think size has more influence then you think. Language death typically severally wounds nationalist aspirations and smaller languages are naturally in much more danger of death than larger ones. A lot more people speak Ukrainian then Estonian.To chip in for my area of expertise: a surviving tsarist empire might (might: unlikely in the event of revolution, which is certainly possible without WW1) put Ukrainian in a condition analogous to Scots, but it wouldn't have any chance of changing the native language of, say, the Baltic people. Literacy and consciousness of these definitely non-Russkiy nations and nearly all others of any size west of the urals was growing because of the changes in society.