Why on earth would WotC do something like this when all of the options are already available and in print? I don't know how many old school games have been released in the last year, but I'm certain you can play OE, 1E, Holmes, BECMI, 2E and certainly 3x through games that are out and have filed the serial numbers off.
The problem is twofold:
1) WotC does not get any income from the thousands of people buying and playing those previous versions of D&D.
2) WotC has no control over those previous versions of D&D.
For the stewards of D&D, if not one of the biggest certainly one of the most beloved modern american pop-culture inventions, both of those are signs of a failure in that stewardship. It works for *me* that I can buy new stuff for any edition of D&D, but if I were the owner of D&D it would be a serious problem and I would be searching for a way to remedy it.