What will programming look like in 2020?

Assuming Atwood's law holds true, we'll all be writing JavaScript by 2020.

In 2004, python wasn't exactly mainstream and didn't have as many mature web frameworks and libraries as today in 2012.

I'd say (and want to believe) in 2020, haskell and clojure would become a lot more popular.

We'll all be speaking APL.