It's hard to say. I don't think he'd come back if he was going to embarrass himself. Is he going to be a dominant two-way 1C again? Not a chance. But having a full 2 years off to train and get your fitness to a high level again could help him make a decent comeback for a 37 year old. Jagr often credits his time away from the rigours of the NHL schedule with his ability to keep playing.
Either way I hope it's with us because if by some miracle he comes back and is a solid player than it's the type of move that could put us over.
All I'm really hoping for is his skating is still solid, he can handle the physicality, his stamina is up to par, his defensive game and IQ is still there and he is still a wizard on the dot. If at least all that is there he is a solid bottom 6C option for us. I don't think that is to much to ask for and honestly I don't think he'd come back if he didn't think he at least had that going for him.