Yes that is true but they also have a much larger fleet than most. Panther is not providing the same services as Landstar, FedEx is also not providing the same, FedEx and Landstar provide different across the board solutions where panther can't. Just because they have brokers, does not mean they they are part of the overall problem, I think when it comes down to it, the deregulation of the industry in regards to brokers is at fault with the internet. The trucker, the guy who runs for a buck a mile is the enabler of the bunch, he allows the freight to drop, as does an aggressive company who undercuts the competition without thinking.
If fuel prices is the mitigating factor to many of the people who decide to hang it up, than a shortage of trucks will happen. Many, like me, want to see the ranks reduced to force the adjustment to the entire industry which means like in other industries, will help everyone in the long run.
Actually all three companies work with a lot of the same accounts. They have the most compacity, think about it with three phone calls one to each organization there are thousands of trucks. If they do not have a truck the broker the load so they become a one stop shop and 99% of the time they do not say NO to the customer! Brokering is positive and goes hand and hand with being a carrier,..anyway to service the account will insure they call back. I would never say brokering is bad, brokers are a great tool for carriers and customers alike to get extra compacity and cover loads. The problem are the idiots that accept loads for peanuts! The industry is just a cycle like you said, if a lot of drivers get out of it, that's more loads in the long run for the die hards!