There are now a couple of smaller disc-by-mail startups who aim to serve that market. I've signed up with DVDInBox out of Florida and they've done a good job thus far.
From what I've seen their biggest current challenge is their mailer. Netflix spent a lot of time designing their signature red envelopes, working with the USPS on ensuring they would survive a trip through the postal sorting machines. DVDInBox has yet to reproduce it - their envelopes sometimes arrive fairly mangled, or have not arrived at all (lost to the bowels of the machines).
From what I've seen their biggest current challenge is their mailer. Netflix spent a lot of time designing their signature red envelopes, working with the USPS on ensuring they would survive a trip through the postal sorting machines. DVDInBox has yet to reproduce it - their envelopes sometimes arrive fairly mangled, or have not arrived at all (lost to the bowels of the machines).