^^Actually, not so ludicrous. Do you know how many perfectly good riding horses go to slaughter every day because their owner didn't have the money to feed them or just wanted rid of them and dumped them at the auction instead of trying to find them a real home?
How many good horses that maybe nobody wanted to look at because they were lame from a minor abscess or a slight pulled muscle so they got snatched up by a meat man?
Given a few days with educated eyes looking at them and educated hands touching them, many of those types of horses could get a second chance.
Actual rehab on problem horses, no, but taking a horse that was once very broke but hadn't been ridden in 2-5-10 years and spending a few days re-acquainting them with their former training is actually relatively easy for folks that know a little bit about horses.