A Requiem For Art Deco Redux

I love art deco. Here are three examples of modern improvements of art deco, all from Chicago:

NBC Tower; Skidmore, Owings, and Merril (of the Sears and John Hancock towers fame); 1989

Citigroup Tower (formerly the Chicago And Northwestern Terminal Building), Helmut Jahn, 1987--note the tiered, arched entryway on the bottom right

United Terminal at O'Hare Airport, Helmut Jahn, 1987

Where did this pro-humanist aesthetic--with all of its attention to detail, craftsmanship, and ingenuity---go?