The first thing to remember is that natural gas trades on regional markets. In fact, in the United States it trades on sub-regional markets. The U.S. is the world's largest consumer of natural gas (about 40% of global demand). In 2015 the U.S. consumed ~29 TCF (around 80 Bcf per day) and that included a very warm start to winter. In 2016 the U.S. is expected to consume 30.4 Tcf (around 83 Bcf per day), which includes ~1.5 Bcf per day of exports (pipeline and LNG).
So, we have a growing regional market that is expected to grow to over 100 Bcf per day by 2020.
On the supply side, U.S. production is expected to fall 4 to 6 Bcf per day this year. As you pointed out, the Marcellus is falling but the big drop is the "associated gas" in the oil shale plays like the Eagle Ford. Those oil wells do produce a lot of gas and the gas production falls faster than the oil production.
See the EIA's Drilling Productivity Report at this link:
http://www.eia.gov/petroleum/drilling/#tabs-summary-2 Notice that the Eagle Ford has the highest rate of decline for both oil and gas.
All of the above points to a much tighter U.S. gas market by the time next winter starts.
Here is the "fly in the ointment": We have a LOT of gas left in storage because of the warm winter.
"Working gas in storage was 2,478 Bcf as of Friday, March 11, 2016, according to EIA estimates. This represents a net decline of 1 Bcf from the previous week. Stocks were 998 Bcf higher than last year at this time and 807 Bcf above the five-year average of 1,671 Bcf. At 2,478 Bcf, total working gas is above the five-year historical range."
It looks like we will end the winter heating season with around 800 Bcf more in storage than normal. Keep in mind that "normal" keeps growing since the U.S. gas market is growing so fast. We always need lots of gas in storage locations all over the country.
Price: Natural gas under $2.00/mmbtu is an unsustainable price. Only the very Top Tier areas make sense to drill at that price. I think we will see $3.00/mmbtu by year-end, but there are a lot of moving parts to this equation. Just like the oil price, speculators set the gas price on the NYMEX futures exchange that you see quoted each day. The physical markets can be much different than that price.
Read our recent profiles on Antero Resources (AR), Gulfport (GPOR) and Range Resources (RRC). These are all solid "gassers". SM Energy (SM) is not listed as a "gasser", but they produce a lot of gas and NGLs.
PS: These companies also produce a lot of NGLs and I expect those prices to move up faster. In fact, there was a nice increase in NGL prices from Q3 to Q4.