It's interesting as far as developments but I don't think D&D is as strong an IP as Marvel/DIsney. While the novels were popular, outside of Driz'zt, D&D doesn't have character recognition to bank on to drive a similar style of franchise and the different worlds aren't recognizeable enough to really be connected to D&D as a franchise. Not much really separates FR from LOTR except maybe a more Raimiverse (Hercules/Xena) vibe that could be present). There was an argument made that Iron Man, Thor and Cap were B-list Marvel characters when Marvel launched their film franchises but they weren't really. They were still recognizable and Captain America had been an icon of comic books for over 50 years before his film launched and most arguments again him were similar to arguments about Superman, lacking relevance in a post 9-11 world but that was largely becuase people weren't familiar with his re-invention under Ed Brubaker going on at that time or even familiar with comics in general by then because of the id 90s crash. He had been reduced, in pop culture, to jingoism and Nazi imagery for a WWII storyline was difficult to pull off and was "needed" with the Red Skull announced as the main villain. Plus the stink of the early 90s Matt Salinger film blah blah (sound familiar?). But each of those characters were still KNOWN outside of comic books from T Shirts and action figures and animated series appearances.More or less with the addition that Hasbro/WoTC is trying the leverage D&D brand recognition to horn in on the multimedia franchise pie occupied by Disney/Marvel
D&D has... Driz'zt and the cartoon from the 80s plus a couple of really bad D to Z list movies, in reverse order. They haven't had a media blitz of nostalgia with the popular animated series to really properly revive that to bank on that recognition in spite of having the rights to license it out etc now. They didn't work out an action figure line in house, just one Driz'zt figure that was online sales only and then handed the license off to NECA who are producing a line based on the old school LJN figures (smart move there by NECA). What characters do they have to sell the idea of a D&D franchise beyond the game and video games? The novels even are limited to Salvatore and a much delayed DL book.
Banking on D&D to sell the ideas of worlds of adventure with no pay off of a meeting, except maybe as a planescape style adventure of popular characters, which is part of what sells Marvel as a franchise, the promise of meeting, would be incredibly difficult to pull off without recognizable characters. When Iron Man's end credit stinger hit people were buzzing about Avengers, right off the bat, Nick Fury, all of it because as much as people were trying to claim Marvel was launching off B-list characters, Avengers was/is, even then, just as recognizable as X-men or Justice League/SUper Friends. The media implied that it was a gamble to even launch with these characters since Marvel didn't have their "superstar" players. So playing with a Multiverse like D&D? A Forgotten Realms movie, a Dark Sun movie, a Ravenloft movie, a Dark Sun movie and then into Planescape to pull off a Marvel style media gambit? Huge gamble with an even bigger risk of loss. The toylines could do this, Transformers, GI Joe, Mask? Perfect for it. D&D not so much.
Now a Forgotten Realms series that gives us likeable characters that builds to a planar adventure in the third installment that glimpses the other worlds through Sigils doors? With a shot of Jason Momoa on Dark Sun (just an example) or Johnny Depp with a Spelljammer docking into in the Rock of BRal? That could build out the franchise in such a way but it is a slow burn, a slow build to create a media franchise and create enough genre diversification to keep D&D branded films coming out for a while but no guarantee interest in the brand can carry for that long since D&D seems to wane in popularity significantly with every other edition.
Another thing they could have done was use Hasbro to relaunch those old LJN figures in a toyline with modern updating, for an animated movie, since they own those characters, rather than letting NECA do them. Then do a more adult line (which is probably happening anyway), with the new movie and sprinkle in characters like Minsc, Forgotten One, Cattie Brie, and others to keep the line moving. Then they could compete with Marvel.