Transition to digital is going to take well over a decade. Average people, (not techies), tend to buy medium size tvs and run them for 15 years until they need a cap kit at which point they buy another one. Unless everyone in America magically buys a new set then it will be 10 years before that 85 percent saturation point is reached, perhaps longer, since falling prices on standard sets in the last few years have meant that a HUGE number of people have just purchased new 33-36" standard sets. I know I personally bought a 33" one last year.
Projection TVs are a small percentage of the market, LCD and plasma sets even a tiner percentage of the market. It doesn't matter how much shelf space Best Buy dedicates to them, Joe average isn't buying them, Jane average REALLY isn't buying them, and Grandma and Grampa average will NEVER buy them.
The fanciest TV I have ever actually seen in someone's house is a 36" Sony WEGA (standard set). I was with my friend when he bought it 5 years ago, and even back THEN they were saying that it would all be digital next year.