Oops, Dish Network forgot about all those lost ppv's that may be stored on those smart cards. They may not have ever gotten the ppv's off of them anyways if the phone lines would have never been connected in the future so that is another way of looking at it. I am sure the same thing happens when DirecTv has their card swaps.
They are probably swapping older revisions of the smart cards that are able to be compromised the most or those cards that are in receivers that are more of a target of hackers. It is a wonder that they did not try to get the cards from the 7100/7200 Dishplayer receivers yet.
If you do not have Dish500 card ready on your system information screen then it probably will not be able to accept the new card. New receivers with new smart cards would have to be sent out to those customers at Dish Network's expense. They would probably try to send out 111's which is their new cheap small receiver that they have. Sounds like another situation for Dish Network.
If someone has an older receiver with UHF, dolby digital, or HD capability then Dish Network may have to fork out some money to get those customers those options on the new receivers by giving them a new 811 or DVR as a replacement. Either that or give them a UHF upgrade kit for the 111/311.