Quote from Jayford:
There wouldn't be a DOM as you can't have futures trading with being able to short. By definition, there is a short for every long in futures as you really aren't buying or selling anything, but entering into a contract to deliver or take delivery at a specific price at a future date. Financial futures are a little different, but my point is that the futures industry by definition will always have shorting, or it won't exist.
Kinda makes outlawing shorts in equities silly when people can just do it in futures.