Or, maybe they can't raise the money. Oil operators are like real estate developers in that they drill when they have financing, not when its most profitable. EnCana has been hot and heavy in unconventional gas, and I have guessed they have some big hedge funds backing them. Could be their results combined with low prices are cutting in to their drilling budgets. How many of their "locations" are in the Woodford-Barnett shale? How many are in doubtfull areas like their Culberson-Hudspeth county lease blocks, or their blocks in the western part of the Newark Barnett Shale field?
  How has their projected production matched up with their results? These guys are better promoters than I am, but investors generally get discouraged when the production and prices are not up to snuff.
Aren't natural gas prices down significantly in the past year?

Could this have anything to do with slowing of drilling activity?

Gas prices are roughly half of what they were a year ago, when they rose to $14/mcf post-Katrina and post Enron/Dynegy/El Paso manipulation. But they are still 300% of the year 2000 gas prices.
EnCana doesn't need hedge fund money to support operations; few, if any, of the big ones do. You are talking about a company that is literally spewing $$ and heavy cash flow.

They are one of the largest land holders (last I checked, which was about a year ago, the largest land holders in oil sands) plus made some smart moves in unconventional gas in years gone by. They were considering converting to an income trust this year (now put on hold by the Canadian govt decisions announced Oct 31st).

Seems to support "we've got the resource, why race to pump it out when costs are high, when we can wait, and still produce huge profits".