Even with the brevity of that article, one gets the impression that the author was padding to fill space. While I resonate with what he says, it's a poorly-written piece.
To play Kincade's advocate for a minute, though - no painter paints the totality of human existence. No artist can even hope to capture "life as it really is". Someone (I wish I could attribute the quote, I use it all the time) said that all art is primarily selection. At most, an artist strives to accurately portray a slice of life - a brief perspective on life. OR, perhaps more precisely, to innacurately portray a slice of life - to exaggerate or distort a slice of life so as to show it for what it really is under the skin.
While I agree with the author - Kincade's work strikes me as saccharine, too - I wonder sometimes if that's a fault of mine and not Kincade's. I went through America's art instruction meat grinder. I absorbed many of the art world's prejudices and cynicism. If Kincade is trying to portray the good, or the pure, and through it to induce longing, maybe it's the jaded, fallen part of me that's reacting against it. The part of me that rankles at the thought of goodness and purity. The part of me that is comfortable in sin, and uncomfortable around righteousness. Dr. David Wells defines "worldliness" as that system around us that makes evil seem normal and righteousness seem odd. Maybe my artistic tastes are too "worldly" to appreciate Kincade's work.
But then again, theologically it's impossible for Kincade's work to be unfallen, even if it might be redeemed. Perhaps what rankles is not goodness, but the facade of false righteousness. Since it cannot possibly BE purely good, perhaps it rings false when he tries to pass it off as purely good.
I don't know. I do know that I grow uncomfortable whenever we trendy folks cast scorn on brothers in Christ for being un-hip. That elitist sense of "I'm in the in crowd, I've got taste and style" often defines itself by excluding others, putting them down. We in the art community are perhaps most prone to this sin. I try always to root it out in myself, and to give everyone the benefit of the doubt. At the same time, I believe there is such a thing as objectively good art - there is a hierarchy of value in art that is not purely a matter of preference. So, I get hung on the horns of my own dilemma. My petard is a-hoisting. Who can rescue me from this body of death??
Here's my observation. If you were the only one on Earth, you would never be at a loss for someone to argue with.