Interesting read. I too find it a tad hard to follow some of his points, but I can get there in the end.
Different markets have different demands. If you do stock photography, clearly you are shooting "for the market". Scenic work, IMO is the vision of the photographer, and that is all that counts, your own taste. Some will like it, some will not. The moment you wander from that, to crowd pleasing only, is the time to hang up the camera and retire.
We all have a different way of seeing a shot, and that is part of the fun of photography. It does not always work, but that is life.
I certainly know of a few folks, who are not really what I would consider good landscape photographers, but who have the "neck" and "push" to throw their work out there, this goes for other areas of photography too, even general. Exposure is the key factor, it seems to count for more than talent. But fine art is a different field in itself.
Slightly OT, but I have a question for Alain is he is about. I very much enjoy looking at your photos, ..just a note here, or rather a question. I have always felt shadows can be a vital part of a photo, yet I would describe some of your shots as rather "high key". Wondering if this is just shooting to your own tastes, or a specific goal here?