There are other hurdles to overcome with this idea,
Your comment about the fact that there are only a few different ways to hook up theater components, and only a few different types of connector that would be needed. This may be true with the majority of components, but not all. What about balanced audio, XLR, these are not used in basic systems, but those of us that do higher end very often look for equiment with these connections. There are alot of different ways that you have to hook up hole house audio systems. Matrix audio is wired one way, Linn is wired completely different, AMX or Crestron another variation and I am sure there might be a few others out there I haven't looked into. Where the plasma goes, you are right, most of us will have a standard already of what we wire to that location (from where may vary depending upon distributed sources and local sources). What about Lutron or lite touch, Liteolier/ Vantage. 4 different companies with a range of products, Lots of different wire spec's can be used here, The average electrician can't just walk in and start wireing these systems up, even the electrical side is different than what he is used to.
If the standard is trying to spec wire, is it also trying to spec where the wire starts and ends? This would also be a part of our business that we have learned, speaker placement, keypads and other equipment, a builder doesn't know, the electrician doesn't know, heck most times the home owner doesn't know, thats why we are there.
One other question, maybe I missed this in one of your posts, are you trying to make something that will be written in a book or presented in a cd rom with diagrams and instructions etc, or are you actually trying to make a product(s)that will be actually installed (termination boards?)