I'm beginning to think they would- especially since they would then get you out of a grandfathered DVR to one where you'd have to start paying the DVR fee. Plus, have the wonderful (

) option of VOD.
I'm inclined to try to hang on until DISH makes the final move (2009/2010?) to MPEG-4 & 8PSK and the 721 simply won't work anymore. But if they keep dying every 2-3 months, I won't be able to put up with that. Still, I'd rather get a deal to up to an HD DVR- maybe one with 2 sat tuners, 1 ATSC OTA tuner but only supports one TV. Maybe in another year or so.
Back to the 721 #6 saga. It would not authorize the night I called. The CSR said probably another 8 minutes, and we ended the call. 90 minutes later, still trying to authorize. Overcast skies, but the ViP622 & 508 were working fine. Trying to go to menu or do any other function would not work, it just stayed at the authorize - do not disturb screen. So I disturbed it by unplugging it. Still no dice, just went back to authorizing. Left to eat supper. Eventually it stopped trying to authorize and let me enter the menu. Sometimes check switch would give me all greens on the tuners (if I check switched from 119), but would often give red Xs on tuner/sat 1 (if I started check switch from 110). Left it overnight. Next day, #6 was behaving like #4- could get 110 or 119 but not both. Guide would only show some channels (e.g.- either 120 or 121, but not both- diff sats). Finally called Dish again, went thru the usual (which I had already done, except for checking 61.5), was told the thing would trundle for another 20 mins or so, and work fine. If not, try unplugging and if that doesn't work, call back.
After 20-30 minutes, the 721 appeared to finally show all channels in the guide, and worked fine- perhaps a tad slower than I recall. Later I tried to create a favorites list. Everything worked fine, except no list was in fact created. After repeated tries, with a limited number of channels selected, it finally "took." but renaming it "fav 1" just left it at "list1fav1" or some such. Adding channels did not work. I figure I'll try again tonight- maybe the 721 just needs a day or 3 to "compose" itself and work properly. I'm also testing to see if it records properly from the guide. BTW, "The Stepford Wives" on the free ShowTime preview is the new one, not the old one- don't bother wasting electrons recording it.
So tonight I'll play some more, before I return the old 721. Might have to call in and have even this one replaced. Or see if it gives me 2 months service like the last one. At some point, if the failures continue, either Dish or I will get tired of it and propose another solution. Maybe I'll just shift my ViP622 to dual mode and feed the master bedroom TV from there.
All the CSRs I dealt with were wonderful and capable. Especially the last one, who realized I could just be told to run a check switch and did not insist upon reading every little step.