Estimate: 2030. About 15 years for this to become a truism. Amazingly fast given the magnitude of the change.
In the 19th and 20th century, illiteracy was seen as an inability to read or write. Illiteracy damaged your economic prospects and your ability to function in society as a whole.
With the arrival of the Internet (and the world of knowledge it connects you to), being illiterate is increasingly being seen as an inability to learn on your own.