Netflix has never dropped their DVD service even though they wanted to many times. There are still places in the US where broadband is unavailable.
Also, due to first sale they don't have same license restrictions as they would on streaming. Once they buy the disc they can rent it as many times they want for as long as they want.
I've considered re-adding the DVD rental, I've been using Netflix since they included the coupons in DVD player purchases, because they have the films that aren't available on Netflix streaming and it would be cheaper than adding the myriad streaming service subscriptions.