Big problem with that. The whole idea of having a dvr is to save programs for latter viewing or repeat viewing. Change providers and you've lost anything that you've recorded. Unless you've purchased your dvr you have to send it back to the provider and anything stored on a ehd is lost since the ehd is keyed to the account number. If that secenerio works for you, go ahead. You'll be a drop in the ocean. For me it doesn't. With 2 HWS's and 5 ehd's, I have to much recorded to think about changing.
Besides, the wife has figured out, for the most part, how to use the dvr's. If the wife is happy, I'm happy.
For me personally , I don't care to record programs and watch them over and over. Once I see a program , I am finished with it. No desire to keep it indefinitely. I realize that other people do though.