I was, and still am, a big proponent of sleep sacks. DD will be 2 at the end of the month and we still use them (obviously not the swaddle ones, the toddler size that looks like a sleeping bag). Swaddling was the only way she'd sleep in the beginning. I think this is great that this hospital is using them as a matter of course. They're also super easy to use, especially in the beginning when your swaddling game leaves much to be desired!
ETA: Oops, quote fail. Meant to quote
We loved using sleep sacks with LO-- they were a lifesaver and I would highly recommend them to anyone with a NB.
That being said, I think this is fine as long as they are willing to a) send home parents with a sleep sack (as they do in the article) or b) be willing to allow blanket use, too, but still educate about the sleep sack. Some low income families may only be able to afford blankets so they should have the right to learn how to swaddle properly using a blanket instead of using a sleep sack.
I am all for anything that helps lessen SIDS risk