I know of no such theory that would make that claim. Doctors have had a jargon for as long as there have been doctors, and while SOME of their terms have made it into common language, most have not.
What does "common language" have to do with anything? I'm a technical guy, but I don't use technical terms "commonly." I use them when they are appropriate, such as discussing technical things. And if I'm talking about a medical condition, even though I am not a doctor, I am going to use technical terms that I know, as best I know how to use them. If I use a term incorrectly, or the doctor uses a term I don't understand, I'm going to ask for an explanation or look it up later. It's not difficult. What's difficult is having a useful conversation or worse yet relaying useful information when people refuse to use the words best suited for the conversation. Your example of "meat vindaloo" below is exactly an example of that. Why would I use a vague or general term when a specific term exists that does the job better?
No, they won't. Just what terms do you think someone who is going to see is doctor is supposed to front load into his brain? Just which of the tens of thousands of medical terms will you need today? How about learning the jargon in today's newspaper? Got a clue, before you try reading the article, what's going to be there? Nope.
You are being obtuse and you know it. I was not suggesting people memorize the dictionary prior to picking up a news article, I was suggesting people have a dictionary handy when reading one. There is nothing new here - didn't they teach you that in English 101? Turns out not everyone knows the meaning of every word, and intentionally using the most simplistic terms possible to ensure people understand the words at the expense of the meaning is ridiculous. In 2012 when learning the definition of a word or phrase is a mouse click away, there is less a reason now than ever not to be specific.
didn't say that and you know it. Let's communicate with our intended audiences so they understand what we are saying, not leave them stuck running for the dictionary because we're too erudite to actually communicate.
You did say that, exactly. You said the average person reads at the 7th grade level, let's talk to them as such. I am proposing we talk to them at a 12th grade level, and let them get a little smarter than they were before. It sickens me to the core that anyone would accept the notion that dumbing down mass communication serves any other purpose than selling magazines and newspapers. It certainly doesn't actually made them smarter.
When you say "I ordered a PRI T1 line to replace your SLIP over 56k modem, Gramma", you aren't educating her, you're leaving her behind deliberately.
My Grandma would smack you for that remark, and so would everyone in my family save my drunken uncle. My grandmother may or may not know what those terms you used are, but she wouldn't look too kindly on me talking down to her. If she has a question about the terms I used or how I used them, she'll ask. Even at her advanced age, dismissing her with "I got you a faster internet connection and that's all you need to know" is nothing but condescension. She is old, not dumb.
(She would also probably also ask why you you channelized a data connection, which is in fact dumb.)
You'll save time and not drive your readers away. You're competing for his time, and you'll lose as soon as you lose him. Write an article that's too hard to understand because you're using jargon and the first reaction will be "turn the page", not "find a dictionary".
So you are a publisher! Explains your bent. Get readers at all costs! How about this: We don't treat people like they're 7th graders for a while, and then find out once people are used to some hard to digest words now and again, we throw more at then, and eventually they are 12th graders! Kind of like when you teach a 7th grader algebra, and then later you teach a 12th grader calculus! Just a thought.
You've just proven my point. "T1:
I have indeed. You are a 7th grader. No doubt about that. So, in the vein of my approach, here is some information to get you started on the way to 12th grade:
http://en.wikipedia.org/wiki/T-carrier: ""T1" now means any data circuit that runs at the original 1.544 Mbit/s line rate ... During the 80's companies such as RLH Industries, Inc. developed T1 over optical fiber."
There is more, of course, but that's the gist.