Nah. I've seen plenty of people who could walk at that level (not straight, but they could walk...).
The world record is something like 1400. It was a man in Poland who was driving a truck full of pigs to the market (yes. Driving.).
With hard work and dedication, it is possible to become a World Class, Olympic Caliber Alcoholic and walk around at levels that would render a regular person unconscious.
I've seen a guy have a withdrawal seizure with a BA of around 350.
The way BA is measured, that 1400 BA means that 1.4% of the mans blood was alcohol. Some of the "light" beers have alcohol levels of around 2-2.5%, so his blood was nearly as strong as beer.
In the ER, we have a thing called "The 500 Club." To qualify for membership, you have to have a BA of 500 or more, and be functional. You don't have to walk straight, but you do have to be coherent.
And you cannot have Performance Enhancing Drugs in your tox screen. If you're on meth or cocaine, you'll be awake past the point that you would have passed out otherwise. You gotta have standards...
The highest I've personally seen was a guy who was awake at 820.