Right, even if the D&D movie draws a huge portion of the player base, it will need to appeal to general audiences to make it a smash. The OGL debacle will be meaningless if D&D takes off in a movie series. Wizbro can write off the TTRPG at that point. How big is the design and development team for Monopoly?
I do suspect that might be what they're hoping for. . .for D&D to become like Marvel, and be more of a movie and TV "franchise" where the original printed material that built it is relegated to a very minor part of the business.
I don't think that will work though, because Marvel is built on strong characters and good stories with a vast pool of lore to draw from. Even if your casual fan doesn't know the history of Iron Man or Black Panther past what they see on screen, the writers and producers of those movies have the benefit of decades of storylines, of characterization of heroes and villains from different writers, of a wealth of materials they can use to build on to create a good story.
D&D is mostly a game about people's own original characters, and largely about original worlds. Yes, there are the published campaign settings, with their own settings and own worlds. . .but we haven't seen any sign of them doing a Drizzt Do'Urden or Elminster movie, or a Rudolph Van Richten movie, or movies based on famous D&D adventures like Tomb of Horrors, Throne of Bloodstone, or Expedition to the Barrier Peaks.
D&D movies so far (including from what we've seen, the upcoming Honor Among Thieves) have been fairly generic fantasy stories that just incidentally use some D&D IP around monsters and magic and such, that could work as generic fantasy movies with only minor twiddling, just with the Dungeons and Dragons brand name attached.
That's not going to be the huge rainmaker that Hasbro is hoping for. . .I really don't think that making a fairly generic fantasy movie and slapping on the D&D brand will rake it in the way they're hoping.