Obviously sooomie isn't talking about himself. He's talking about the large-scale drop-off in Americans running 2:20. And I think his point has a lot of validity. Basically what he's saying is that across the board, jobs in America require more hours per week in 2005 than they did in 1975.
Now, this is not to say that you can't find a job that lets you run a lot. It's only to say that there are less of those jobs available.
Put it this way: Let's say in 1975 jobs X, Y, and Z exist. Job X requires 30 hrs/week, job Y 40, and job Z 55. So if someone with job X likes to run as a hobby, and is fairly serious about it, they can run 120 miles a week, no problem, and still have a life. Someone with job Y probably can as well, maybe a little less depending on how well they manage their time. The person with job Z is going to have less hours to go around, and if they have a family will probably end up running 50-90/week, depending on dedication.
The difference in 2005 is that job X probably requires 40/week, job Y 50-60/week, and job Z 60-80/week. So over the population as an AGGREGATE, there will be less people with jobs that are conducive to running. This doesn't mean that someone with a lot of dedication can find work that doesn't require too much of their time.
What it DOES mean is that college runners in general will graduate, look for a job, and then start trying to find ways to fill their free time. If you're only working 40 hours/week, you can use this time to try to become a very good distance runner. But if you're working 60 hours/week, you will probably decide not to run, or else just to run for fitness, or to keep in decent racing shape.