I think the key part is the copy part at the end there.
For example: a bunch of 3DS games are dying due to age. So physical media can br lost just like digital.
If im recalling correctly, it's due to the quality of cartridges and how the games were stored on the carts(?). In which case getting a copy online is your next best bet. I feel like this whole rental system is the same deal. If they remove the ability to access the products you paid for, then you're perfectly fine to go grab a copy from somewhere.
The biggest reason to buy physical in my eyes is that having physical and digital versions of something acts as a failsafe for everyone when it comes to media specifically



