Agree with most of the posts here. A picture library manager summed up the situation to me a while ago, by saying: "The problem these days is everyone's at it, and editors are more concerned in these hard economic times of getting something "on the cheap". Quality is a secondary consideration. Unfortunately, there's an endless stream of young hopefuls frantic to get their foot in the door, so they let their pictures go for peanuts".
The few who earn a living of sorts, usually shoot on 4x5 cameras. Even they usually have to supplement their income by doing lecture tours, holding "lessons in landscape" at prime locations etc.
Travel & Landscape has been possibly the main victim of digital. Even those calendar etc. markets who still prefer film based material, aren't paying realistic fees that will support a professional.