The 522 and 625 are the only 2 models that really are going to be an issue. 721, 921 and 942 models have been recalled and replaced with VIP series product.
There are a few 501, 508 and 510 receivers out in the field still, but its been a while since I ran accross one.
Like I said all along, Dish will either buy Tivo or pay the licensing. If Dish has to pay the licensing, there will be a slow migration to an all VIP platform!
The only sad part for me is when my 625 becomes obsolete either by Tivo or completion of the Western Arc so goes my 2-120 minute live buffers!.