So you're making my argument for me: you don't believe in Slack's longevity because they're satisfying a permanent need. You believe in it because it executed w

So you're making my argument for me: you don't believe in Slack's longevity because they're satisfying a permanent need. You believe in it because it executed well. Nothing prevents anyone else from executing better. The permanence of the need doesn't point, in any way, to the permanence of this particular supply.