I’d rather see more efficiency in each run (time spend and drop chances) than turning raid farming towards this burnout end. If you could farm a raid each day, each day lost feels like fomo. A similar scenario already plays out when camping the MoP world bosses with 10s of chars.
I did it with a few mounts from heroic 5mans (ZG, Utgarde Pinnacle) for some time and doing that on a daily basis was already a lot.
It could even be a more ideal scenario when you could encounter these 1% drop bosses in a challenging version either in timewalking or solo play and have a high or even guaranteed 100% chance on those drops. Spending a few hours on a 100% reward is probably more welcome for most players than running up to one-shot a boss 100 times.