Everybody simmer down. The dust hasn't settled yet. Two likely outcomes:
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The Works with Assistant integration will allow us to create routines that basically do what we could do before with IFTTT and other Works with Nest integrations (still unknown what this will look like exactly). With that, we should be able to setup routines that will allow virtual switches on HE to be controlled. So for example, your Nest Smoke/CO alarm goes off, your Google Assistant routine will turn on a virtual device on HE and RM will take over doing what we need.
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Alphabet bows to public pressure and back peddles
As for controlling Google products from HE, we are fine as long as they don't kill Google Assistant Relay. Can't speak for everyone else that doesn't have this capability. It's pretty awesome. Very worth the effort to setup the node.js server on a Raspberry Pi or an old computer.