Assuming that the article is correct (and perhaps it is not), I think this is bad for software development. It takes a lot of work to become really proficient

Assuming that the article is correct (and perhaps it is not), I think this is bad for software development. It takes a lot of work to become really proficient in any one language. Multiple languages? For most people, that means only adequate proficiency — or even barely adequate proficiency — in some of them. Don't we already have enough lousy programmers? I do expect a programmer to be able to handle at least a few languages, let's say C, HTML, CSS, Java, PHP, Emacs LISP. Now throw in SQL, JavaScript, C++, ASP.Net, Python, Ruby, etc... It's not just syntax. How can anyone know most of the ins and outs of all of these, learn best practices, understand the libraries, keep up to date on new versions?