Even if we ignore the time value of money, Slack needs to quadruple its revenue and turn it all into profit to justify a 16B valuation. I can see it happening

Even if we ignore the time value of money, Slack needs to quadruple its revenue and turn it all into profit to justify a 16B valuation. I can see it happening since so much is being integrated into it from 3rd parties, but it's a very tall order.