No one is saying this will Happen, it is just being talked about an it would only be on newly built ships.
So the way they get new ships, (one or two every few years), it would take a very long time to replace the fleets or retrofit the older ones.
And lets face it you know it would be a trial run on the first ship and if reviews don't go over well they will be forced to rethink everything.
I'll be on the summit in November and I just checked the app for the MDR menu. Just as the OP indicated …. menu is one different seafood, pasta, meat/chicken, and vegan choice each day. Other then that they have Grilled Chicken Brest and NY Sirloin listed every night and it looks like most of them are served with Mashed Potatoes and Green beans-carrots, (some say seasonal vegetables). Choices don't look like anything special; hopefully enough bad surveys will make them re-think the Menu choices.
Premium selection are now a up charge (Listed every night)
Filet Mignon $19.99
Broiled Lobster Tail $16.99
Surf and Turf $34.99