I work for Fitbit. I don't speak for Fitbit, but now that the deal is closed I can share my own opinions and ask my own questions.
What makes you think Google wants Apple to have the only good smart watch? That would be the main effect of sunsetting Fitbit.
Nest still exists after their 2014 acquisition by Google, and Nest is not as important to any other part of Google as Fitbit is to Android. Why would they be more inclined to sunset Fitbit?
Chances are that Fitbit won't be around 2-3 years from now, hence no real reason to invest in a product from them now.
I'm not saying that they'll 100% kill off Fitbit, but it's very likely. Google already does hardware and software that does a lot of the same stuff, no point in having 2 brands.
That's very debatable, considering the smartwatches from Samsung, Fossil, Garmin...
That aside, if they end up tying Fitbit accounts to Google accounts, the whole jig is up anyway, because no-one wants to buy a hardware product whose operation depends upon not having Google shut your account down with no recourse other than to raise a stink on sites like HN.
Wear OS shows how little Google care about good smart watches. It's six years old and still bad, if they wanted it to be good they would've fixed it years ago.
And as a bit of a metric nerd the Garmin data exports rock.
Oh, and I haven't charged it in over a week.
There is also the Venu and Vivoactive lines with touch screens, but their battery isn't nearly as good as anything in forerunner's camp.
My combo is Apple Watch by day, Oura Ring by night. I don’t often wear them together.
Very happy with the setup and would recommend.
Disclosure: I also own Garmin Stock, but am a FitBit user (owned FitBit stock too but sold when the GOOG acquisition was announced).
Only issue I noticed was the heart rate monitor was wildly inaccurate but this was on a much older version (the 2 I think, maybe the mi band 5 has fixed this)