Second rule of the trade club : DO NOT TRY TO SHORT THE STOCK MARKET.
Governments of the world gave us a final signal : they do not want the stock markets to collapse. If it's necessary they will print not billions or trillions , but kilions of money. These freshly printed dollars and euros are coming into the stock markets. So if you don't want to fight with an enemy with unlimited life and support it's better to ride this bull in the shadow of the powers. Will this cause a currency market collapse? Mots probably yes. In 202x. Till that time we don't have to worry just buy the dips.
In the following days or weeks SPX will break to new highs and will force a terrible short covering rally as every short player will have to realize that the Brexit was just another Bear trap.
WIth or without UK the stock market will rally.
Show must go on.