Has there been a season of Agents that hasn't been deemed "it's last season"? Not on these boards, I'm sure.
http://comicbook.com/marvel/2018/02/...shield-finale/Marvel’s Agents of SHIELD is currently in a tough position. It holds a late Friday night time slot and its average 2.3 million viewers the smallest audience of any ABC drama. It's average 0.6 rating in the key demographic is the network’s second lowest next to Once Upon a Time, which is in its final season.
However, Marvel’s Agents of SHIELD sees a 117 percent demographic bump when Live+7 DVR numbers are taken into account, which is the fourth-largest increase in all of network television. It's unclear how much ABC values the delayed viewing numbers, but ABC head Channing Dungey said at the TCA press tour that she is “cautiously optimistic” about SHIELD’s chances at a sixth season.