I think it's quite simple. The live action trailer for GDP went viral, someone looked at it and thought "yes, this is daft enough to work" and got the rights to it.My thoughts are that the writers are excellent choices. Guardians was great, and what little I've seen of Gravity Falls is gold as well. The story choice, however, pops my bubble. Out of everything they had, they went with a game that came out in February that is not at all reprasentative of the series itself, and is also relatively unknown, even among the fandom.
I wanted to know what everyone else thought about this? Does anyone like the idea? Do people have better ideas? Do you feel the writers won't work out?