Fundamentally the Corona virus is now out-there, everywhere. Potential containment is history, we'll just have to all be exposed to it, many contract it and for some endure mild flu like effects before having it added to individuals natural immunity banks, but be more severe to some, fatal for others (2% to 3%).
We're not even at the end of the beginning. China has been dealing with it for a couple of months even with its extreme regime based management. The Fed injecting 1.5 trillion is equivalent to 5% of the year start stock market value, timed to occur with the end of week along with the Euro doing similar to have a possible 'green' day. Suspect however that will just be a dead cat bounce, the consequences/issues will run for weeks/months yet.
Avoiding deflation at any-cost, propping up markets may not work. Especially as year end 2019 valuation were already relatively high. Short selling is likely to again be banned as in India at resumption next week IMO.
A year from now, and it will have been just another down dip historical event, earnings will recover, stock price trends from wherever they end up will be generally upwards. The main factor however is from where. I'm speculating from S&P500 1500 (so anticipating yet further declines to yet come).