D&D is nowhere near WOTC's flagship product, though, and certainly not Hasbro's.
D&D is absolutely one of WotC's flagships. Don't believe me, have a look at their home page and tell me what brands immediately come to mind. Check out their about page and tell me what two brands are mentioned by name.

Sure, it's not one of Hasbo's flagship products, but that doesn't matter when they're evaluating what WotC is doing (except insofar as it means Hasbro isn't above telling WotC D&D is losing too much money and to can it).