The abrupt closing Sunday of Neil Simon's "Brighton Beach Memoirs" after only nine performances has cast a brief, uneasy shadow over Broadway's fall season, ironically one of the busiest in years. And the revival's collapse has had a ripple effect, forcing the cancellation of a second Simon production, "Broadway Bound," which was to have opened at the same theater (the Nederlander) in December and then run in repertory with "Brighton Beach." "A lot of nice people on stage and off will be out of work and a lot of good partners and investors will have lost a great deal of money," producers Emanuel Azenberg and Ira Pittelman said in a statement. "They all deserve better. It makes us sad." Yet its failure -- the shortest run ever for a Simon...