Airline travel is a hassle, but more people are travelling than ever. I.e., its not useful to extrapolate from the personal to make predictions.
There are plenty of routes that are limited due to congestion. Consider - if you could, by just changing the plane, double your capacity for the Christmas/Thanksgiving rush ? That is a valuable capability.
Imagine another STRIKE during the holidays, and having all those people in the terminal. Ooooooh, the wielding of union power over twice as many victims will unavoidably tempting.
Buying an expensive aircraft because it's useful for two months out of the year? Bad buisness plan if it's not economical the other 10 months.