According to retail data, 35% of Marvel’s Wolverine sales were physical discs. This comes from Ampere Analysis (via The Game Business), which tracks sales data across major markets globally.
The data suggests Wolverine shifted 2.16 million units in September (it went on sale September 15), and a significant portion of those sales were on-disc. In Europe, 51% of Wolverine sales came from the boxed version. Zooming in, more than two thirds were physical sales in France, but two thirds were digital in the UK.
Keep in mind that Sony can also be betting that not everyone will stop buying completely. Just because 35% bought this game physical does not necessarily mean that when they stop selling discs, they lose 35% of sales. Only half, or a third, or a quarter, might stop, and Sony might be betting that most will just suck it up and continue buying.