I think we're already seeing a backlash against the always multitasking, loss of focus culture that Slack has become the poster child for in the SASS space. Just like Facebook or Twitter, Slack is engineered for constant dopamine-fueled engagement, which quickly turns it into a bad and ultimately unproductive habit for companies that use it. I am already seeing competitors like Level use Slack as a warning example and I think this is just the start of Slack's problems.