I don’t think anyone is saying that chromecast as a “functionality” is being killed. It’s not the same product, the new one is a set top box compared to the current dongle, with better specs and 3 times the price. People would buy multiple chromecast dongles to have it all around their house or to carry it when traveling. Now, many will not do it with this set top box.

They kept the same name and functionality but definitely “killed” the old product - chromecast dongle which everyone knows as chromecast.