A global all-share index is a bet on continued productivity and growth for the world. Is this current crisis enough to bet against that? If yes, then what's the alternative? Guns and ammo??!
For the more speculative among us, I've increased my holdings in AAZ (no-debt, cash generative, gold-miner) and CAML (minimal debt, resources miner - copper, zinc and lead - can you imagine the bounce back here!?).
The above is not advice, but let's have some perspective here. If this is an existential threat to humanity, do you think things like 'ethics' and 'process' will be maintained? E.g. those who say a vaccine is 18 months away...really?! Come on now.
I think it's fair to say there's going to be a big slow down and I suspect recession on the back of this affecting the major economies of the world. So yes, the current crisis is enough to bet against that. My view is that of course it'll go back up, but the bottom isn't here yet. It won't be here until the UK and US go into similar lockdowns seen elsewhere. So for me it makes sense to sell now, hold cash, and buy back in when the price is even lower than today. I can't say what the best time is, but I believe that the falls will keep coming so it makes sense to sell and buy back in at a later, lower, point, to maximise returns.