I would find this article hilarious if I weren't horrified that people may take it seriously.
In the 50s, people could identify Buckminster Fuller, Saul Bellow, or Jackson Pollock. Many educated people now could identify Frank Gehry, Toni Morrison, or Jeff Koons. But having a cadre of public artists who "shape in meaningful ways our image of ourselves or define our collective values" is a very narrow way framing the issue and has not been the trajectory of art for decades, if ever.
Look at that reception to Marina Abramović's The Artist is Present. People stood in line for hours. I saw a segment about it on CBS Sunday Friggin' Morning. The public is engaged with art, it's just not the art that the writer wants them to be engaged with.