Although the app [TweetDeck] is favored by a number of power users, some have argued that Twitter is really focused on its broad user base — most of whom either use the Twitter website or mobile apps — and therefore it doesn’t have any interest in TweetDeck.
That statement right there answers it. Twitter Pro. Why not? Make Tweetdeck the pro tool for managing business accounts and charge a fee. Hurrah, a revenue stream!