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Google is discontinuing the Chromecast line
(www.theverge.com)
This is a most excellent place for technology news and articles.
They are, I saw an article for it the other day. Some compact set top box running Android TV that costs way more than any Chromecast ever did.
Casting is nice but I'm thinking now is a good time to consider switching to something like Apple TV if you need a dedicated streaming device since there's basically no price difference anymore.
I've had good luck with Roku so far, I know they're questionable but short of building a system to handle casting/streaming for me they seem to be the best bet right now