And would Exxon possibly blow smoke? Long range reports are fountains of optimism; if we could believe them we would all already be wealthy, with a flying car in the garage, time travel commonplace, and colonies on stars already in process due to faster than light travel.
Regardless, and I'm sure some oil shale will survive no matter what, financing plans based on $100 oil won't survive, so there will be less exploration and low yield spots will be passed by, so there will be less economic by-product. Bottom line is that cheap oil is good for some in the short term (including me), but it overall indicates that the global economy is weakening or else demand would be keeping prices higher.