LOL, point taken; however, they have no rights to the Silmarillion, and the Tolkien estate ain't selling.
And the Marvel Cinematic Universe juggernaut behind it! I seriously doubt Guardians (good as it is) would have done half as well without the Iron Man, Avengers, Cap, etc pedigree to trade on. Even with their stellar record, Marvel thought Guardians was a huge risk.
And, yeah, the licensing deal with Sweetpea is spectacularly bad. It was done back in the TSR days by people less aware of the value of the brand.
The reason they don't do a Drizzt or Forgotten Realms movie without the D&D name is simply one of brand recognition - Dungeond & Dragons is a spectacularly well-known and valuable brand name; Forgotten Realms (and even Drizzt) just don't have the same value.
I think you have the sequence of events turned around. Hasbro licensed Transformers to Dreamworks and Spielberg ran it. Dreamworks hired the writers and the director. Hasbro Studios was created a couple years later, financed in part from the success of the Transformers franchise. The new self-financing arm is called AllSpark productions. It was only after the first Transformers movie from Dreamworks that they went and reacquired the TV rights so they could produce new cartoons in house.
I think Hasbro has enough money in feature films now to self-finance and develop a D&D movie, but they have already agreed (at least in principle) to sell the license to Universal.
So Marvel must have balls of steel, seriously.
Yes and no. It was a calculated risk - failure would mean they'd lost a lot of money on making the film, but they'd know not to do it again.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.