He hasn't worked there as a full timer although he did work a Jakked match against Essa Rios in 2001. Since he's 36 years old soon maybe WWE will feel like he's too old, but if he's going to go then now is the time. WWE has shown a willingness to sign accomplished workers from other places like Kevin Owens, Finn Balor and Hideo Itami, so maybe that door is open for Joe. No idea if he would have to start in NXT although that seems possible. Maybe that's something he would be willing to do since NXT is such a great product.