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In fact, this will impact G Suite customers, more likely on the enterprise side of things. We know that Google Voice integration will be saved.
A G Suite lead says that remaining Hangouts users will have a safety net in messaging with Hangouts Chat and Hangouts Meet.
We don't know when exactly Hangouts will be going away, but given how much neglect this messaging client has faced, we wouldn't be surprised.
SMS in Hangouts gets out of Hangouts soon according to a letter to G Suite admins. But you may still cling on if you have Google Voice or Project Fi.
And by roadmap, there IS no public roadmap. Just reassurances that features will be coming along and that visions are in place for Hangouts.