Well... remains to be seen if this follows the path of a lot of Samsung's other features. I think it was... maybe a year or two ago, that someone did a deep dive into the metrics of a lot of Samsung's stuff they toss into their phones, things like S-Voice and apps that overlap with non-Samsung offerings. I recall that while nearly everyone tries out Samsung's own stuff, some ridiculously high amount, high 90%s, used it once or twice than abandoned it for the third party offering and by a month after purchase, they were no longer touched.
I get what Samsung is trying... they want to be more than a phone OEM and want to be an ecosystem builder like Google. But wanted to be and doing are two different things. Google's ecosystem is built off the fact that they are the dominant force across the internet... Their mobile platform runs 80+% of the world's smartphones and their services, like gmail, maps, chrome, etc are equally as dominant. They are a services company and do a far better job than Samsung, who is a sprawling consumer electronics manufacturer...
And... just as importantly, Google is platform agnostic. With few exceptions, their stuff can run on everything... Android, iOS, desktops, etc. So even if you switch around all the time, you have access to all that stuff they provide. Samsung tries to leverage their stuff to get you to buy more Samsung phones.
So Bixby, like many of the Samsung features that preceeded it, is an inferior product running on a limited number of devices. That doesn't bode well for Bixby's long term success.