Can you imagine the uproar if older HDTV tuners suddenly stopped working with new broadcasts?
Odds are some "smart" TV's are losing YouTube, or will with the next change. By the end of their 20-year life-expectancy, most of those things will only be able to play HDTV and HDMI. The ones that aren't bricked by malicious malware by then, anyway.
There might even be some that lose functions before the warranty runs out - is the manufacturer liable for firmware updates to maintain functionality?
Google's clearly going to externalize all the costs of reacquisition and recycling - it's not established what obligations, if any, they have when they offer a product and refuse to support it for a "reasonable" time. I'm just surprised with that with a Google of money, it's not worth it to them to hire a guy to keep the old API working, so that those eyeballs don't migrate to other services. If Youtube fails and Hulu keeps working, it would be an error to assume that people will just go buy a new TV to keep up with YouTube - they will substitute other services in most cases.