Good riddance. Blockbuster had a long-standing policy of not carrying movies rated above R (this includes artistically legitimate NC-17 and unrated movies, as well as adult films). This is similar to how Wal-Mart does not carry CDs with Parental Advisory stickers.
I find this kind of censorship offensive, since the labels and rating systems supposedly exist in order to protect the right of adults to purchase whatever material they want, while allowing parents to make informed decisions about the type of material their children consume.
As such, I don't shop at either chain.
Now, the CD argument is somewhat moot nowadays, since there is such a good selection of music on iTunes, but video rental stores are still alive and well in Canada. Netflix has only recently been released and it does not have anywhere near the selection that Rogers Video (large national chain) or many of the independent Vancouver stores (e.g. Black Dog Video) do.
Furthermore, neither Rogers or Black Dog stores pander to censorship. Movies are appropriately rated and labeled, and the adult section is separated from other movies.
Even if Netflix improves its selection here, I still enjoy browsing titles in the store, and I often find cool independent movies which I doubt are even available on Netflix.