First of all, I never said I wanted to disrupt Slack, I simply posed the question to the community to start an intelligent debate about how they might be displaced in the future. If you lack the foresight to look that far head, that's okay, you can say you don't know how they can be disrupted.

There have been multi-million (and billion) dollar businesses started by disrupting major players in their space, by solving the problem they are trying to solve, with much better technology and approaching the problem from new angles. If you think tech companies aren't started with the intent of disrupting other companies, you are living in a bubble.

http://www.claytonchristensen.com/books/the-innovators-dilem...