At this point it’s a pretty small portion.

Last quarter 85% of all game sales were digital.

https://www.gamespot.com/articles/sony-just-reported-a-new-r...

They've also been pushing digital-only PS5s and PS5 Pro so there are fewer reasons to get a disk if you have no disk drive. They have created the problem that they are "solving."

Which you can explicitly buy a disk drive for, if that’s important to you:

https://direct.playstation.com/en-us/buy-accessories/disc-dr...

They actually did a good job giving the consumer choices - it’s just customers didn’t choose physical media.

I wonder how many units the 15% represents, and what the percentage would be compared to number of sales in 2010.

Yeah, the percentage has got smaller, but the industry also got much bigger.