I meant that competing might damage their own bottom line (or they might see it that way). The Tome of Beasts Kickstarter was pretty huge. WOTC might figure that putting out a competing monster manual any time this year would result in them getting fewer sales because it's too similar to a major product that will be brand-new. If they wait until next year, people might be ready for more new monsters by then, and meanwhile, WOTC can put out some other type of book that doesn't have such direct competition.