I don't know how long they're going to effect this ban but to give you a preview of what banning short sell can do, just take a look at the China stock market. The chart is like the Eiffel tower.
The shorts make the market effective as they provide a floor at a bottom where no one else may be willing to buy.
I'm all for a permanent ban on naked short sells but to have an outright ban of all short sells is plain stupid.