Damn, if they didn't appear in the artwork of Meowth, Wobbuffet, or their ARs I think it's safe to say Jessie and James are truly retired from the franchise as a whole alongside Ash. I figured they would get to stick around for occasional cameos on account of their quasi-mainline status due to Yellow/LGPE, but combined with the fact that they haven't returned to Go or Masters in over 4 years (and all official Masters material that includes every released Trainer always omits them and Ash) this feels like the final nail in the coffin.
Makes sense from a branding perspective, but still sad to see them go. A folder with the Rocket Trio was the first Pokemon merch I ever owned.