Isn't that basically a 1/2 IM? 1.2mi swim, 56mi bike, 13.1mi run. How similar do you want two events to be? To me, it's ridiculous that there are so many different lengths that are trying to become the standard.
That tells me that triathlon as a sport, isn't sure what it wants yet. That's not necessarily good for the growth. Some standardization is key, in order to make the sport accessible and understandable to the masses. Look at running, and it's logical progression for a new runner...5k, 10k, 1/2 marathon, marathon. Clean and simple.