Did you know some activists doing their best to revive already extinct languages?
Yes, if any language went obsolete, its story didn't halt at all! Many activists, who are interested not only in linguistics, but history as well recover old languages, which native speakers ceased to exist many years ago. Most famous example of the successfully revived language is Hebrew! The language was reopened by Eliezer Ben-Yehuda in the late 19th and early 20th centuries, so nowadays Hebrew is widely spoken in Israel and Jewish diasporas abroad.