Agree.
This would be limited to maybe 3 or 4 rows (a “sub-economy” class?), but not a whole plane.
In order for a plane to be certified for commercial passenger use, they need to pass a real-world evacuation test. A full plane of the “flying public” (can’t be a bunch of 80 lbs. gymnasts) need to go from seated to outside the plane within 90 seconds (How Aircraft Are Tested For Evacuations).
Seems unlikely that an airline would bother with the maintenance staff training, spare parts, etc., to make a handful of very low revenue seats viable.
