I don't fully agree with your statement but the outcome is the same. We really don't have a doctrine for culture & language...
not so sure we disagree...

There are lot of junior Marines and NCOs leading and designing training that hits the target culture...The major issue is that there is no doctrine so the training being done on the small unit level stays at the small unit level.
I know, right? I read the materials for several of these classes while researching for something else. A lot of the materials are incredible. Too bad their makers and the contect just wanders away, and the wheel is regularly reinvented.

When the culture specialist are hired to conduct training, the KSAs play into the hiring process. Ultimately, because there isn't a clear defined doctrine the instructor usually is hired on a subjective basis.
What I have heard (a *lot*) is that the opposite happens- the instructor is hired according the a strict interpretation of the rules. If they have to hire the person with the most time in the field, you get the guy 15 yr old PhD research experience because he has 5 years in the field, and not the guy with two recent tours, because he has less than 5 years. You get someone with a Masters in anthro, with work in behavioral modeling but no military experience, *not* the guy with an undergrad in criminology who worked in intelligence in Iraq.

The key to the most effective training is shortening the feedback loop that gets lessons learned from the field into the training system. While I take exception to the statement that there is not clear doctrine on the instructor hiring process, "As it is currently practiced", training (both program standards, program eval, and trainer standards), knowledge management (KM), and COIN doctrine do not support the most effective cultural training.
-COIN doctrine provides the directive that we should have it, and leaves it at that.
-KM relegates cultural lessons learned to the types of KM tools from which we could never reliably get information out
-Program eval standards allow contractors to evaluate test performance at the end of a course, then say, "We're awesome!" There is no follow up on how that culture or language training was applied (or not applied) in the field.
-Trainer standards block the most qualified, in terms of recent field experience, from being trainers unless they meet byzantine guidelines
-(and this is what we really agree on, nichols) The culture training program standards are being made up as we go along, often by the contractors that are designing the programs (talk about foxes, henhouses, etc.)

But be careful what you ask for...flexibility is also required for effective cultural training, and doctrine doesn't provide that yet. Maybe it's better to be ignored so you can do what you want...

Sidenote: The Peace Corps has done this effectively for more than 40 years. They offer immediately relevant language and culture training to the same age group as most junior enlisted and younger NCOs, that they can implement at a highly functional level within 8 weeks. I've been through it. Institute for Defense Analyses and the Strategic Studies Institute have noticed it (report is here...their methods are not secret. Modifications for a military application are already being discussed, but no one would make nearly as much money off of this type of training...

One more thing (I swear): If ya'll think it would be hard to a build cultural interaction simulation that's effective, you should tell the companies that are building them like gangbusters, and to the People looking at buying them at I/ITSEC a few weeks ago.