Inhumans is easily the black sheep of the MCU, getting killed by critics and fans after only one season. The show was criticized for a rushed plot, some odd story choices, and some bad CGI effects. With all the bad publicity that the show has received, it's easy to see why many people think the show isn't getting a second season. Even other Marvel actors on ABC think the show is canceled.
Agents of S.H.I.E.L.D.'s Ming-Na Wen was asked if she would be open to a crossover between her show and Inhumans. Her first answer was literally "I think that show got-" before stopping and admitting that "she can't multitask." It's clear that the actress thinks the show is canceled and no one can blame her, given how poorly audiences reacted to it.
Ming-Na Wen isn't the only MCU figure to not think highly of Inhumans. Kevin Feige, who really wanted to make a movie with the characters, ignored a question about the show. Guardians of the Galaxy's James Gunn wasn't too kind to the show either, saying very few things can save Inhumans right now.
Thus far, the status of Inhumans is up in the air. It's not clear if the show will get canceled or Disney gives them one more season to try and make things better. Agents of S.H.I.E.L.D. is in its fifth season airs Fridays at 9 p.m. ET on ABC.