If you have sufficient reserves to last it out, then a year or two with no margins or negative margins should not mean a huge decrease in company valuation. If you lose 20% of your next 10 year profit because you lose 2 of 10 years, then that that justifies a 20% drop in share price but not a 50% collapse.
if you believe that, then I'll trade you 20% of my expected 10 year income for 20% of my current discounted net worth (which is theoretically what a company's market cap should be, a discounted claim on future distributions).
revenue today (or in the shorter term) is always more valuable than revenue 10 years out. put it a different way, what if there's another "act of god" in a few years? the probability of an extreme event occurring within a discrete timeframe increases as your timeframe gets larger, thus your certainty in revenue projections should decrease as you project further out.
