I spent some time at Orbital at a time when they were trying to launch ORBCOMM. What they were doing seems similar in feel to SpaceX. I also noted that ORBCOMM is one of the first scheduled launches for SpaceX.
Interestingly, Orbital was started by an entrepreneur with a vision of small launch vehicles and he managed to actually pull it off- it was not some huge spinoff of an existing giant. I wonder how much the two are talking.
Friends of mine who worked on the early days of Orbital's Pegasus described a situation that sounded very startup-like to me. (I worked there in the late 90's, but on Hubble, not Orbital's commercial projects).
Orbital had modest success (if an IPO can be considered modest). So it seems not only plausible, but likely that a new approach is what is needed here. Perhaps SpaceX is the next iteration of a leaner approach that will actually scale to the meet the grand vision.