The company I worked at previously tried to force MS Teams on everyone. Problem was that most developers there ran Linux and the client was far inferior to Slack on that platform. Unsurprisingly very few developers used Teams and it failed horribly as a decent communication replacement. It became yet another communication channel devs may, or may not, respond in. End result: email still reigns supreme, complemented by xmpp for the non-devs with the technical know how to understand how to connect to the internally hosted server.
So my view is that until Microsoft get their act together, Teams is not a serious contender to Slack. Companies can get it
"free" together with their Office subscription, but most developers won't use it until it works decently on their development platform of choice.
That's the discussion we're actively having now. My only concern is how to move the knowledge and context that's currently in Slack somewhere else. Also, who knows if Teams will actually catch on - though with Microsoft threatening to get rid of Skype, it'll end up being the more official looking meeting app anyways, so why not bring the rest along?
I’m pretty sure Teams is here to stay. It’s growing. MS is investing a lot of resources and it’s improving rapidly.
But I think your point about MS getting rid of Skype for Business in favor of Teams is the most important one. Once that happens, which MS has stated publicly, Teams will become a necessary app for MS to support, since enterprises won’t tolerate MS not having s chat service in O365.
