I think if it already had a screen I'd have a camera, but I don't like the idea of now every car having to have a screen. Even though most cars now have screens anyway it shouldn't be something forced.
I read through the ruling to look for this.
First, my head hurts now. Legalese does not make for easy reading.
Second, the ruling explicitly stated it is not against alternate display solutions. In particular, it called out several manufacturers' solutions to put the display in the rearview mirror much like Ford does/did with some of their lower-trim models lacking a large center dashboard display.
The ruling is mostly concerned with producing a suitable enough image, which it states will be when standard test objects set a standard distance away from the camera produce an image of each object at a minimum visual subtended angle of 5 degrees of arc which, for reference, is the apparent height of the large letter E in
Snellen charts when viewed from the standard 20 feet (6 meters).
So, dashboard displays are not the only allowable method under the ruling. Meeting some other criteria on positioning (the ruling toyed a little with a comment suggesting the display be mounted behind the driver facing forward, deeming it impractical), displays can be mounted wherever a manufacturer can meet minimum image requirements.
Practically, though, this means more large center screens, as it is simply easier to do that.