Check this out. The characters CONTRACTUALLY cannot return to TV or movies for at least two years if they've been canceled... Which means 2020 currently.
https://io9.gizmodo.com/netflixs-marvel-shows-cant-come-back-for-at-least-two-y-1831056170
https://io9.gizmodo.com/netflixs-marvel-shows-cant-come-back-for-at-least-two-y-1831056170