Considering the costs to make a HD disc, and the small potential market to sell it to, it will pretty much quickly convert to BD only. They are not going to spend all the money authoring, pressing, shipping, stocking, etc for a small market that is only going to shrink. They did it before because there was a chance the market would continue to grow and they could sell the back stock for years to come. They were not making a profit on this that will show up on the bottom line, if it does not add to the bottom line it is not worth the company's time and effort.
Laser disc collapsed, Pioneer had a blow out sale of the warehouse one weekend and it was over. No one was going to make stuff for a shrinking market.