Missing the lead time aspect.
There's no point in capping tight / shale oil, the production decline half life is only a couple months. The last wells drilled before the price drop are rapidly declining to zilch now. Its a treadmill and you must keep drilling. If you want production in say two years, you start planning the new wells now. We stopped awhile ago. In a very long term sense you're correct, but in a short term sense shale is dead-ish till maybe 2018 even if the Saudis hike the price today. If you're looking for scams and propaganda, in shale they all live in cornucopian fantasy projections of decline rates vs actual historical decline rates, and never the two shall meet. Sure if the decline half life of a shale well was 40 years instead of 4 months, America would be energy independent, yeah. Generally for reports and analysis of shale, the further from geological reports the more comedic and disconnected from reality.
Oil sands aka Canada get killed off a different way. Its very expensive and the extensive financial structuring required to buy all the loot to produce is crazy. The Saudis basically make an example by saying as long as they're the swing producer, they decide when and how badly Canadian oil sands will go bankrupt. Who will run out of cash first, you as a sands producer, or the Saudi Royal Family? There's some talk oil sands have never made a profit and never will, when everythings accounted for, especially predictable Saudi price manipulation. And talk that the EROEI ratio is less than one. Most of it is just talk. But the facts based on that talk are correct that its very marginal, right on the border of being a real energy source like traditional oil or merely a jobs program / bubble scheme like ethanol was. Anyway the leadtime point is its hard to raise money to resurrect a bankrupt financial ecosystem. There are two strategies. One is wait for the Saudis to collapse and no longer be swing producers while hoping the world economy holds together till other sources come on line, the other other is some kind of nationalization of the sands / job program where you can "in your face" to the Saudis that Canada is going to produce half a million barrels a day no matter what the price is manipulated to. Both are kind of unappealing in their own way.