I don't think anybody can say that a company with their resources and a year plus timeframe couldn't put together a working product of the limited scope of a game table even in beta form by this timeframe... and they are losing real money in overhead every month they can't charge even if you ignore the opportunity cost of running servers for games.
The problem is that WOTC's resources in software development are nil, because they're not a computer-game company. And software development is a relatively difficult business (as compared to toy and book publishing).