I don't think "it's going to be around" is the main reason people are using Zoom instead of Hangouts: regardless of how you interpret Google's confusing messaging here, Hangouts is clearly not going to disappear while lots of people are relying on it in the middle of a pandemic.

Instead I think it's that Zoom is better: easier to join, it can show you more faces at once, more controls for the meeting owner, lower CPU usage, etc.

(Disclosure: I work for Google, speaking only for myself)