How much of this is an "end" to Chromecast and a rebranding of Chromecast to "Google TV Streamer"? It seems like the bare-bones experience of a Chromecast being tied to a phone (or browser) is getting replaced with an Apple TV like experience. If this is the case, it might be a (rare) example of a good branding shift from Google. I have had two Chromecasts (the original and an Ultra) and I feel like both were hampere…
And it's about time. "Chromecast" was always a terrible brand IMHO, because it had utterly nothing whatsoever to do with Chrome, except that there happened to be a "Cast..." menu item in Chrome. But you can cast from lots of apps that aren't Chrome. It would have made just as much sense to call it "Gmailcast" -- that is to say, no sense at all.
"Google TV Streamer" isn't particularly memorable, but it's perfectly logical and intuitive. And it doesn't introduce confusion with a browser. Google wants the brand to be Google directly, not some sub-brand. Makes sense to me.