There is no way to compare oil to NG.
NG has sales value limited by pipelines or underground storage space, which is limited.
Oil can be transported by truck from the wellheads, to tanker ships and sold anywhere in the world.
The difference between the two equates to supply and demand. You cannot successfully speculate an increase in price if there is an abundance of supply relative to demand.
Speculation is not the source of high prices. Limited supply relative to demand is the source. Speculation is only one of the pricing steps given the supply and demand conditions.
The only lasting way to lower price is to increase supply relative to demand (or decrease demand relative to supply or both). Far more oil is traded in markets outside the US. To make the NYMEX more restrictive only pushes more traders to operate in foreign markets. To think that we will be priced separate of those is naive, especially considering that most of the crude oil we use is imported.
Also natural gas is shipped by tanker, even LNG is shipped by truck in some locations. It is only a matter of price; the transport costs are greater than compared to oil, but not prohibitive in many markets.