It's not impossible. Some BH stans still push the(ir own) idea that BH wants nothing to do with YG - yet they literally just entered into a multi million dollar business collaboration with them.
Scooter is Ariana's manager but he's not her record label. They have a say too, as does Ariana. Who knows? But BTS x Ariana is bound to be first on the docket, so we can expect something more in the vein of Boy With Luv and Dynamite this year. (No way Ariana will take a just-happy-to-be-here cameo portion of vocals like Halsey did though.)