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Google is discontinuing the Chromecast line
(www.theverge.com)
This is a most excellent place for technology news and articles.
Won't Chromecast still exist as a service? Just because they aren't making the dongle doesn't mean all the Chromecast enabled devices are just going to stop working or even being made. Just about every display that's made has Chromecast built in now.
The casting protocol? Yes. Those devices? No. They're moving to Android TV devices with different branding
as you were corrected elsewhere, no they don't.