WotC has to sell something can't be offered by rival companies. Every mangaka can creates her own version of Dragonlance, with other characters but the almost same feeling. Videogames companies can sell their own virtual tabletop for dungeon-crawler games, or virtual miniatures wargames. When Disney reborns in the 90's other cinema studios published their own version of the cartoons because fairy tales are public domain. Hasbro tried to sell Kre-o toys, but the people would rather the original Lego.
The power of the brand can help to sell more, but anytimes it isn't enough. I can go to the toy shop to buy a figure of a space captain, but I need a good reason to want the toys based in some famous franchise. And you know there are Chinese ersatz toys plagiaring famous IPs.
I imagine the future like this (and after the end of the game a special software uses the data to develop a machinima movie):
If WotC makes money with some special virtual software as talespire, I guess some videogame company will try to imitate the same formula (for example Epic Games with Fortnite: creative mode adding quest creator), and I wouldn't blame it.
Other companies could creater their own agnostic-system virtual tabletops.
* Do you think WotC could publishes audio-books for mobiles based in the game-book "choose your own adventure"? Maybe some interative video for little children. The screen of the mobiles are too small to read comfortably, but the tabletops are different. It would be like the cartoons to promote toys like the little monster pet shop.
* Today working in Forgotten Realms is easier because they have got the help by the original author Ed Greenwood. This allows more freedom to add new things or changes because Ed. Gr. can say what is the "orthodoxy" of the lore. If WotC dares to add changes to Mystara or Greyhawk there are serious risks about complains by the fandom as "this is not my Star Wars any more".
* If there is a updated publishing of Dragonlance modules we could find some retcon details, like in the last "Curse of the Strand".
* D&D hasn't to be too family-friendly because the rules are too complex for preteens as DMs, and if an older family member is the DM this has got the right tone. But videogames are different, when lots of preteen plays Fortnite, for example.