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Sogdian was one of the most prolific languages in asia with influence stretching from Khorasan to western china, until it was gradually supplanted by Tajik Persian after the islamic conquest. When did Sogdian become fully marginalized? Wikipedia says 1000 CE when it transitioned into Yaghnobi, but Khwarezmian survived until 1200 despite being even smaller and less important. That too khwarezmian survived until the mongol conquest whereas sogdian's fate is vague and likely wrong. I personally believe sogdian was the dominant language until the 1300 AD when it was supposedly fully supplanted by chagatai turkic and tajik persian, with remainder becoming yaghnobis.
When did Sogdian as know it actually become extinct? All sources I've come across seem to be quite wrong. What would be the latest possible time for sogdian to make a comeback? Any comments and suggestions would be the most helpful!