The bigger question is what's the upside to keeping him signed? They got the best years of his career, and outside of making him a road agent or something, there's nothing left for him to do in TNA. WWE clearly has ideas on how to use them. Hopefully they're in a coaching role and not on camera.
Besides, this isn't TNA anymore. The regime's changed multiple times, the roster is unrecognizable to what they had six years ago, and outside of filling 30 minutes of programming with old footage, they rarely acknowledge past TNA in any other regard than "look how long we lasted."