I agree with general sentiment that teaching journalists programming is not a realistic option - not only is it time consuming, but might also simply not workout for people who chose to be journalists. It is a humanitarian area of knowledge, after all, not technical. Of course, some might have affinity with programming, but generally speaking (from my experience at least) young journalists won't appreciate the idea of extra class where they have to learn programming.
However I believe infographics and data visualization specifically are important when trying to convey densely-packed information so it has to be taught journalists in some form. They should know that given some data they can pick certain type of visualization that would work well within the article.
I think some general course on data visualization without jumping into programming would work fine - explain what data visualization is, how it is done, what kinds of data could be used with it, what kinds of representations of data are available and so on. Plus share some resources where people can view various visualization samples.