I think this is a great idea, though I'd do my own checking up on anyone who wanted to borrow my dogs. But like the article mentions, I travel a lot and usually I have a house/dog sitter watching over the pups, or I leave them with trusted friends in an environment I know to be safe, but sometimes, I can find no alternative but to have someone come in and walk and feed them and turn lights on/off, just check on them. I could see using this in those cases.
I live in an Air Force town and take the dogs out to a gathering spot during the summer. On most days, I'll have maybe a dozen enlisted guys come over just to pet the dogs and play with them and always, there's a story about how much they miss their dog from home. I love it.