The programming world isn't as balkanized as natural languages. If Tiobe is to believed, the top 20 programming languages account for 85% of "use". By contrast, the native speakers for the top 20 natural languages only have 50% of the world population. Here's a spreadsheet with the data.

  http://j.mp/hiPGXA

Other factors to consider: learning a new programming language requires less than a tenth the effort of learning a natural language (my estimate). That's for people. Getting my laptop to speak a new language is mostly a matter of downloading the interpreter or compiler. Granted the interpreter or compiler has to be initially ported to the architecture or OS. So not only is there less programming language balkanization, but the cost of balkanization is less.