I figured it out myself, in the end: It was Neal Stephenson's
The Big U. That's where I know "things fall apart, the center cannot hold" from.
Although I guess that's not strictly true, since the version in The Big U goes like this:
Tenuring and tenuring in the ivory tower!
The flagon cannot fill the flagoneers.
Krupp cuts a fart! The sphincter cannot hold
Dear academe, our Lusitanta, recoils.
The time-limned dons are noosed. With airy webs
The cerebrally infarcted bring me down.
The East affects conscription, while the curst
Are gulled with Fashionate Propensities.
Shrilly, sum reevaluation is demanded.
Earlier-reckoned commencement is programmed!
What fecund mumming! Outly ward those words hard
When a glassed grimace on an animal Monday
Rumbles at night; unaware that the plans aren't deserved
Escapists' lie-panoply aims to head off the Fan.
A sign frank and witless as the Sun
Is mute in the skies, yet from it are shouted
Real shadows of endogenous deserted words.
The concrete drops down in; but know I now
That thirty-storied stone steel keeps
When next the might of Air are rooks unstable.
What buff be; its towers coming down deglassed
Slumps amid Bedlam in the morn?