In my mind, Shield is the kinda show they won't cancel just like that, they will instead announce the last season as the final season (and probably give it a shorter run). So get ready for "The 6th and Final Season"
To be honest, I have no prob with it ending. My wish was for it to reach Infinity War, and I was thinking about that back in S2, so happy we got this far.
Yeah, season five was basically the dream. Everything else is gravy.