Nearly all of the people who sell third party physical carts and media are also selling digital versions as well, which sell in much greater numbers.
The physicality is a novelty, much like vinyl records. It’s a market sure, but not a significant one that calls for a paradigm shift.
>also selling digital versions as well, which sell in much greater numbers.
Happy for them, I'll even buy it if it's DRM-free with off-line installers I can back up.