Granted haven't caught JR calling a match in a while, but he's felt/sounded checked out almost from the start in AEW when I would catch him. I think JR should be utilized for any kind of in depth person to person sitdown packages. Or any kind of storytelling talking head piece they are doing. And then if he wanted to another voice/mind for Tony to work with.
But, I really don't think he needs to be on the call anymore. Maybe a special attraction call at a couple of the PPVs.
I don't think that JR should call regular matches. IMO, he should only call big matches for guys like Edge, Christian, FTR, Danielson, and the few other guys who can wrestle a JR style match. Jim Ross is only good at calling a storytelling match, he clearly hates the indy style stuff.
JR would shine backstage, though. The man has over 40 years in the business, and could be a valuable behind the scenes asset to Tony Khan, the agents, producers, and booking team.