I have heard that they are on the way out.
On a podcast that I listen two about the future of automobiles they said that one of their friends purchased a new Nissan Titan and then realized that he could afford the gas. He took a $12,000 hit on the trade in.
My thoughts are that he couldn't afford to trade it in. $12K will by a a lot of gas.
Also a friend of mine and I were at a car lot and the sales guy drove us out on their back lot passed all the new Chevy Suburbans. He told us that the new ones with all the options are now pushing close to $60,000. Ouch.