This Design Proposes using Steel and Glass to Re-build the Notre Dame Cathedral Roof

Foster + Partners has proposed the idea of using steel and glass to re-build the Notre Dame Cathedral roof and spire. From the article posted on The Architects Newspaper:

According to an interview in English publication The Times, Foster presented his vision for a new “light and airy” roof for the fire-ravaged cathedral. The previous attic space dated back to the 12th century and was nicknamed “The Forest,” as it contained a tangle of 1,300 timber frames, each coming from a unique oak tree—the sheer amount of wood likely fed the fire that ravaged it last week.

What do you think? Is the design visionary or vulgar?