Point taken, and I agree; there will always (or for several decades, at least) be a niche for old-fashioned tabletop. But in the age of digital D&D, it may not be a niche that can support more than a handful of shoestring producers. Paizo, for instance, would likely be unable to continue at anything like its present scale.
If WotC is trying to create a new market for tabletop simulation their best bet would be to give it as much exposure as possible. This would be accomplished by creating an "online gaming store."
People would ideally be able to go in and play any number of tabletop games, from Pathfinder to Traveller to 4E.
There would be third party publishers and artists that could create intellectual property in this closed market, like virtual miniatures, voice sampling, and adventure creation. WotC could position themselves to take a small percentage off of each of these transactions, in addition to a modest subscription fee. They could sell their own products and offerings next to others in the industry, as they do now. In fact, they could leverage Hasbro's intellectual property board games and cut out the middleman and turn a decent profit as well.
A system like this would enrich the hobby and increase the success of the venture overall.
The problem with WotC is that at a fundamental level, decision makers do not understand gamers. In my experience gamers seldom have intrinsic loyalty to a particular brand. They are looking for an experience. Their loyalty is to gaming, and they most often have tried several types of systems in their time spent gaming. In addition, even the most diehard brand loyalist gets tired of their brand. I'm ready for something different than 4E D&D myself right now, I think I might try a post apoc sci-fi game if I can get the players. I think the 3.0 OGL taught us that; I think that the hobby would have been much better off had 4E been more inclusive to other influences. Unless you are a diehard anti-capitalist you understand competition increases value for the customer.
Imagine that you have all of your retirement income right now sitting in a bank account. Based on the previous electronic offerings WotC has put out and the fact that they will be the only show in town with their tools, how much of your retirement income are you going to invest in that venture?
Tabletop gaming would be much better served in an environment where profits for shareholders aren't such a pressing concern, but in today's marketplace the consumer expects products and polish that are difficult to deliver without outside investment and stakeholder expectations for profit.