At this point of the off season, no one seems to want to part with anything more than mid-level prospects for JD. The closer it gets to the start of the season, teams may be willing to up the ante to fill a hole in their lineup. The best chance to get a Michael Fulmer-level prospect for JD is to wait until July.
If nothing changes, it looks like a platoon of Collins-Mahtook or Collins-Jones. I actually think the team can survive a weak CF. I don't think the Tigers can survive throwing the same bullpen on the field next season.