I remember all the posts on CR about light and stability requirements for doing FoCal with slight failure resulting in wrong AFMA. Add software glitches, compatibility issues and hooking up laptop to it. In the end, the fact that it can do AFMA automatically is a very small part of the effort (considering you don't even need laptop/image analysis with other method).
However, its not about justifying the FoCal purchase or vice-versa. I don't see FoCal going out of business right away, although it will be a serious dent in their business. Hey, not so long ago, people were happily buying a piece of plastic and a ruler worth $1.5 for $70-100. Ideally, it would be best for most people if we could hand over our Camera-Lenses to a competent assistant who can do the job for us, if we can afford and/or justify the need.
So, I think the question should be asked in reverse: Does this method allow to get the job done with comparable effort and accuracy for someone who does not want to buy FoCal?