I didn't miss that point at all. What I am saying is in response to those who claim that UA's plan for $50/barrel oil makes their business model an inevitable failure. According to that logic, everyone's business model is a failure. Including SWA because it assumes no one will price their product according to the cost of doing business. (ie: fuel costs.)
UA has and will continue to raise prices to absorb the "over $50 oil" problem, at least to the extent that they won't lose money. So will B6, F9, and WN, as you have stated.
On the other hand, even WN has limits to how high they can raise fairs and not lose market share to, let's say Ted or Frontier.
Every airline eventually will have to raise fares to continue doing business with $65+ oil. But it only works when all airlines in a particular market follow suit. With WN and B6 having to raise fares, it helps airlines like UA make up the difference between the $50 oil plan, and the $65 oil reality. It's that simple.