I admit I didn't read the entire article... but I don't think it's quite that simple and I would be leary about the care a lot of those workhorses would get. When you match people who see horses as vehicles or machines instead of a passion or hobby, you're going to get a lot of people who aren't properly caring for their horses. Plus, feeding a horse (especially one that works hard) is NOT cheap! Is replacing a tractor with a horse going to get as much work done in the same amount of time? I just don't know if it's truly an effecient and cost effect replacement.
And actually, there are a LOT of horses out there and we should NOT be breeding them fast! In fact, on www.equisearch.com
there are several recent articles about the low horse market and how there are tons of unwanted (and uncared for) horses.