No it isn't. As I said, there isn't a glut of talent out there that they could just "hiring more"
As for work longer hours, these people have lives, get in the real world!
You obviously have no idea of the presures of adult life. That's like saying to Raz, you didn't update you site 3 weeks ago, you could have but you had to take a trip. People have other responsibilities to deal with, for Raz it was a busimness trip, for ILM employees they have families and homes and pets and all the other things that make life worth living.
They do not want to, nor should they have to, sit in there offices working 20 hours a day to rush out a movie.
There was 3 years between ANH & ESB
There was 3 years between ESB & ROTJ
Do we see a pattern here?