I mean, look at the number of violations where horses at auctions don't have food/water or medical treatment (chavez auction, comes to mind), where they don't get food prior to shipping (recent AA investigation report), where horses go down, and are not unloaded and given vet care (Baker lawsuit, Animal Angels investigation).
It's been proven over and over that Big Ag (or most any large industry really) will put profits above animal welfare. If that weren't so, then there would be no need for laws like HPA, Humane Transport act, etc.
And the poster that said we need ARA to balance things out, in a symbiotic relationship, was correct. That's why I don't really believe that there will ever bee a loss of animal ownership/horses/etc. You have 2 extremes, One wanting profit with no regards to animal welfare and one wanting to make animals have the same rights as people. Eventually you meet somewhere in the middle.