Good callout on the qualification requirements. Naively I thought that anybody holding stonks could say they were impacted and qualify, but I now see it's a little more fine-grained.
For the purpose of the discussion though, let's say my (very) small business has been hurt, and assume I qualify.
Something else I just thought about: unless Congress extends the provision, this strategy is really just a one time thing. If I go for it in 2020, I basically just reduced my pre-tax account by about 10%. Not exactly earth shattering.