Do people who still buy DVDs instead of Blu rays realize the

Digital copies have expiration dates whether it's stated or not. Accessibility could be an issue in the future. We already saw Ultraviolet go away. Digital "ownership" is not ownership at all. As long as you can buy a player, your physical media is always yours and you always have access to it. While Blu-ray and 4K may eventually become a niche market, it's definitely not dead. The bitrate alone is better than any digital streaming/copy.