In reading about the Netflix slowdown at various sites it amazes me how many people are blaming Netflix for the problems when it has clearly been USPS actions that have created the problem. When I first joined Netflix many years ago, they would ship the next disc as soon as you went online and tagged the disc as mailed. I don't remember the exact terms, but I seem to remember having effectively 6 or 7 discs out at one time, either in hand or en route. Of course that was before they had distribution centers everywhere.
There is no question that the USPS decision to slow down all first class mail delivery makes the Netflix deal less attractive. The number of movies I rent a month will drop by almost half with the cost staying the same. I guess Netflix could go back to allowing the customer to flag a disc as mailed, and just send the new one based on the customer's word. I wonder how often they got burned when they did it that way.