“Box-office grosses for ‘Shrek,’ DreamWorks’ $30 million flagship musical, have crashed through the subbasement as the recession continues to tighten its death grip on Broadway. … This is a startling collapse for a brand-name show that’s been open for only a couple of months.” Nonetheless: “The betting around Shubert Alley is that ‘Shrek’ will slug it out at least until the Tony Awards in June….”