P2,
Why would the sell off be a lot less the longer we wait? The quicker the markets re-open, the more faith people will have in the stability and integrity of the markets.
Just keeping the markets closed and hoping the panic will go away is not the solution. This will only increase fear and speculation, which will in end lead to a real massive sell off when the markets re-open.
From a fundamental standpoint, nothing much has changed in the companies in which people are invested. Most likely, people who are in it for the longer term will remain unaffected, except for the mild panic swing when the markets re-open.
Also, if stocks are gonna tank, they'll do so on the foreign exchanges in Europe and Asia.