I find this question hard to think about. Who exactly should be pricing in the risk of something like this happening? On both sides there are agents who have taken on risk. Some of the agents paying rent overextended themselves even before the crisis. Some of the agents renting space did the same. So who should take the hit? Nobody (i.e., the government)? Even that solution seems wrong -- do we really want to incenti…
Both should be pricing in the risk. If I buy a house as an individual I'm taking some of the risk, but so is the bank that lends me money. We each have different risks (I can lose the house, the bank can lose the money if they can't make it back by selling it), which is fine.
I'd suggest having a war chest which could cover six months expenses.
I'm not a business owner though... I imagine it's probably harder to do than it is for an individual.