With the advent of cheap, low-cost 3D printing there are now fleets of 3D printers in operation. In my previous life as co-founder of MakerBot Industries, I have dealt with running one of those fleets. I can attest to the fact that it can be a pain in the butt. You are basically forced to use software that is designed to control a single machine, and you end up with control windows everywhere. Close one of them accidentally and you just hosed a build. Not cool.
I believe that low cost 3D printing has the potential to revolutionize not just prototyping, but small-scale manufacturing of parts: from 10 to 1000 units. With a small fleet of 3D printers it is possible to run them around the clock and produce enough parts to run a small business. While this has been possible before today, there has never been software designed with this task in mind.