Exactly what happened to Slack being killed by Microsoft Teams, Meerkat killed by both Periscope (Twitter), Instagram Live. Snapchat suffered the same thing with Instagram Stories; but although they survived, user growth slowed.
We will see lots of audio-rooms on IG, Facebook, Twitter, etc and Clubhouse will join Meerkat as another victim of this VC hype machine, who ironically are hyping them on Twitter!
The rumors of Slack demise are greatly exaggerated. Mostly by Microsoft.
I already have access to Spaces and have been considering trying it. It's not clear to me that anyone would show up, though: they have to be using the mobile app, and I only have ~1800 followers. Maybe people will get used to it? The thing about something like Clubhouse is that the audio chat is _why_ people are there.
I am curious to see how it plays out.