You can say that about any new tech, but truth of the matter is that there are certain advantages to using well know & widely used tech.

I'm not talking about zen-coding or pandoc or any tool specifically, you can make the same argument for e.g. clojure vs java: as much as you'd like to use the shiny new tech, you must at least consider the fact that it's a hell of a lot easier to find x new programmers that can use java proficiently than even x/10 that can use clojure proficiently.

It doesn't mean it should be the overriding deciding factor, but the cost of retraining/learning should at least be taken into account when making that decision.