7 MCU shows that Marvel has cancelled (too soon)
2. Marvel's Agents of SHIELD
Now, hear me out! I know Marvel's Agents of SHIELD ended after a successful run on seven seasons, but honestly a show as fun as this one had so much more left in the tank. It's also worth remembering that it was on-the-bubble for essentially all of those seven years and just-so-happened to end right before the Marvel Studios Disney Plus shows came along. Coincidence? Perhaps not.
Agents of SHIELD started at a time when the MCU was dominating the silver screen, so it attempted to try its hand at the small one too, with the show debuting on ABC - one of broadcast TV's biggest linear networks. It was so tightly linked to the MCU, with appearances from Samuel L. Jackson's Nick Fury, Cobie Smulders' Agent Maria Hill, and Hayley Atwell's Agent Peggy Carter. However, it ended at a time when Marvel Studios decided to extend the MCU's reach via the high-quality Disney Plus streaming shows - something that retroactively removed SHIELD from the franchise's history.
With a show like Agents of SHIELD that could reinvent itself on a dime, it feels like it could have gone on for a bit longer, and in another timeline it might have. While it got the chance to end on its own terms (unlike DC counterpart Legends of Tomorrow that was unjustly cancelled on a cliffhanger), there was still a lot of potential left on the table. Ten seasons was in sight, so it would have been pretty cool to see it reach that milestone - and match Smallville as the longest-running live-action superhero show.