The price of Airstreams is determined by supply and demand, not the cost of raw materials. Right now Airstream is at maximum production and still far out for delivery times. Perhaps the new capacity at the factory will help supply catch up with demand, so price increases may slow down in the future but I doubt that they will actually drop.
Airstream only sells a few thousand trailers per year (compared to hundreds of thousands of industry-wide units,) even though many boomers may be having a rough time in retirement, I'm sure that there are a few thousand every year who will want and can afford a new Airstream.
Now a deep recession might change things a bit but that seems a pretty drastic thing to hope for just to save a few dollars on a new trailer.