But I have serious doubts that literacy will evolve. (i.e., the innate sense that abstract symbols can be combined to have a myrid of meanings)
You certainly wouldn't doubt that peoples' ways with words will continue to change. And which type of change is to be called evolution will remain a matter of debate. You could say that the elimination of case endings from nouns is evolution - it makes the language easier, i.e. the combinatorial aspect prevails. On the other hand, you could call it an impoverishment in forms, the dependency on context increases, and it becomes more difficult to master the language perfectly.