Yes, the answer is yes. In fact, Disney movies, like many others in the US, often come in a multi-pack with a Blu-ray, DVD, and a digital code. They can sell the digital code while renting out both the Blu-ray and DVD. Then after a while, sell off those used discs as well once demand goes down (they don't usually sell them all, but they obviously want to reduce inventory in line with a lower demand over time)