For better or worse, languages that put am emphasis on readable code tend to remain not-so-popular. Python is an example, but Ada or Pascal are relatively unpopular these days.
But that is one thing I like about Go, because "idiomatic" Go code tends to be very straightforward and readable.
I mean C++ isn't going to disappear anytime too soon, but I like where we're headed with language design. Python isn't just popular, it's monumentally popular, and I think that's a great sign. In my eyes, Ada and Pascal aren't missed, precisely because there are better choices for new projects.
I love what they've done with Go from my experience with it so far, they hit the target on a number of design fronts.
But that is one thing I like about Go, because "idiomatic" Go code tends to be very straightforward and readable.