That was in no way unusual, because action stars like Schwarzenegger, Stallone, Van Damme, and Steven "Adorable Hair" Seagal used to be some of the biggest stars in the world. But then something happened: The new millennium gave birth to the superhero genre, and suddenly having turbo muscles and a delightful name didn't matter as much anymore.
That sounds counterintuitive, because Marvel Studios' Chris collection is an assortment of enormous dudes, but the most popular character in the Marvel Cinematic Universe is Iron Man, played by Robert Downey Jr. Before Iron Man, the most financially successful superhero films were the Spider-Man trilogy, wherein Spider-Man was played by an in-shape (but by no means cybernetically biceped) Tobey Maguire. We don't need our action stars to look like alien gladiators anymore -- we just care about the character they're playing. To be fair, it certainly didn't hurt Guardians Of The Galaxy when Chris Pratt transformed from a dancing watermelon into Astronaut Freakzilla, but we would've loved him either way.
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"They're called love handles for a reason."
The point is, audiences aren't paying to see Jackie Chan or Tom Cruise movies -- we're going out to see the new Captain America and Iron Man films. We won't even go see Robert Downey Jr. films, as Hollywood quickly discovered in the wake of Iron Man's success. You could argue that superhero movies are different, because the main characters wear identity-obscuring costumes, and the original Batman films rotated lead actors like a weirdly specific swingers party, but the same thing happened to movies where the main character doesn't wear a mask (incidentally, almost no member of the current slate of Marvel Studios movies wears a mask for longer than three minutes per film). Star recognition is no longer a deal-breaker for audiences. The Bourne Legacy dumped its titular character and lead actor, Matt Damon, and still killed it at the box office.
It's not clear if the tagline is talking about the characters or their plans for the series.
No doubt the same will be said about the upcoming Jason Statham-less Transporter film, starring some random bozo from Game Of Thrones. This isn't something that can be blamed on miserly studio heads not wanting to cough up the coin to keep actors from leaving franchises, either -- we as an audience have spent the past several years teaching them not to give a shit, because we go see the movies anyway. (Did anyone even notice that Shia LaBeouf left the Transformers series?) It's even affected salary and creative control disputes -- when Ed Norton hit a negotiation wall with Marvel about returning to play the Hulk in The Avengers, he was recast without a second thought, because Marvel knew their audience had an attachment to the Hulk and not Edward Norton. The same thing happened to Terrence Howard -- he was replaced by Don Cheadle for Iron Man 2 and 3 after he and Marvel couldn't reach an agreement over money.