Remember when Jeremy Piven abruptly left Broadway’s Speed-the-Plow, claiming mercury poisoning? Producers were enraged, and took Piven to arbitration to recoup losses owing to the star’s departure. Today they lost, arbitrators from Actors Equity and the Broadway League finding Piven’s self-removal “reasonable” and not in breach of his contract. So producers, remember: when next Piven makes himself available for a big Broadway show, he’ll expect a lot of leeway. Now, who’s ready to make that Piven/A Thousand Clowns revival the world’s been waiting for?