Why Did John Hughes Stop Directing?

Is a question me and my colleague were pondering this morning as we suffered through the post Christmas party blues whilst turning on the PC to start another day. A quick glance at imdb and one sees a laundry list of children's and family films that Hugh's has been writing and is still writing with great prolificness. But a glance further down sees a skyrocket of successful directorial exploits that we all know an love, brought to an abrupt end with the 1991 Curly Sue:

Curly Sue (1991)
Uncle Buck (1989)
She's Having a Baby (1988)
Planes, Trains & Automobiles (1987)
Ferris Bueller's Day Off (1986)
Weird Science (1985)
The Breakfast Club (1985)
Sixteen Candles (1984)

So, what happened. A quick search later I stumbled on this hypothesis by FilmFreakCentral.net:

While the "rich" and the "poor" always learn to get along in Hughes' films, there's no question that his allegiance lies with the latter. Consider the quietly devastating passage from Uncle Buck wherein the slovenly, unemployed Buck, flipping through an album at the suburban mansion of his wealthy brother, notices a wedding photo that has been folded to crop Buck out of the picture: Hughes keeps the scene subjective by lingering on the photograph instead of on Buck's reaction, effectively turning sympathy into empathy. But even at that point, his identification with the underclass was starting to seem a little disingenuous, and once you get to Curly Sue, the last film with Hughes at the helm, his portrayal of poverty is downright paternalistic. I firmly believe that a fear of looking like a hypocrite drove him out of the director's chair--you can be Ken Loach or you can be a multi-millionaire (as Hughes had become by crassly exploiting his ability to churn out a screenplay a week).

See the rest of their piece on John Hughes HERE.