They should remember this is not a monopoly, or a cartel with a price agremeent. Here the players need to use the head for the survival of their PCs, and they were aren't so easy to be tricked or manipulated.
D&D is alive when there are players who love it, despites the mistakes by the company.
Other of the reasons the brand is going to survive is because somebody is going to buy other D&D products, for example comics, toys or videogames.
And Hasbro should worry about the day D&D started to lose popularity because fandom are tired with epic fantasy and they are now more interested into other genres, for example urban horror or sci-fi.
And D&D the fresh and new ideas by the 3PPs. Hasbro needs a good vibe with these.
OK, this may be a serious stumbling block, but they can still recover the lost prestige if they fix the mistakes