Honestly, Marvel should keep the Hulk on the big screen, while using tv to showcase some lesser known heroes, but have them exsist in the same movie world. Lets see something like Jessica Jones, or a Luke Cage, or better, Moon Knight tv series insted!
*Like* if you agree. Haha.
It's not about what Marvel should do, but what the networks will pickup. ABC passed on the Jessica Jones series, and Fox passed on The Punisher tv show. Maybe Hulk will act as a good launch board for other shows like Iron Man did for the films.