My wife & I have a retired racer. They do make wonderful pets. We belong to a rescue group called Greyhound Pets of America. There is going to be a huge glut of greyhounds entering the adoption pipeline—likely more than can be absorbed. So a major unintended consequence will be thousands of the hounds being put down.
Greyhounds are large dogs and do require a fenced yard or be on a leash when outside. But when you adopt one, you get an adult pedigreed dog for next to nothing. They are not hyper, rarely bark, and can curl up in a small space. And they are beautiful athletes. If you are thinking of getting a dog, you might want to consider one.
I had always heard that rescued greyhounds never cease showing gratitude.