While S.H.I.E.L.D. isn’t exactly breaking ratings records, it does have a loyal core group of fans who might follow Daisy and/or Elena to Inhumans if they crossed over for an episode or two.
Perhaps a second season could be exactly what Inhumans needs to really come into its own.
A second season could also give the show the chance to compensate for what didn’t work in the first season.
Agents of S.H.I.E.L.D. features a couple of Inhumans as series regulars.