> strictly speaking, HTML and CSS may be considered programming languages, but they lack control structures, design patterns and other interesting tenants of computer science.

They are non-Turing-Complete programming languages, and part of that is having limited control structures. "Design patterns" aren't a language feature, have nothing to do with being a programming language (architecture has design patterns -- in fact, that's where the term comes from), and CSS and HTML both have design patterns (and piles of books describing them.)

> As more sites gravitate toward complex JavaScript-driven web apps, it may be useful to ditch the general term "front-end," differentiating C.S.-oriented front-end developers from those who prefer visual design.

There's already a distinction commonly made between "front-end developers" vs "designers". What more do you think is needed?