Thanks for the post. Great art in music is also often difficult to perform, particularly in non-art venues. As you suggest it is also difficult to find. 
At least some of the critique of contemporary church music is based upon an effete disdain for, or insensitivity to, music of the people; "folk music" if you will. I love Gregorian Chant, I love some classical music - though I don't appreciate it (a la understand). Unapologeticely, I also am moved by some contemporary, even "church" music which I acknowledge as "not great". 
Unless music is encouraged, presented, endured, taught , experienced, neither the good nor the rare great emerge to last.