Matt Murdock (Charlie Cox) has returned to the Marvel Cinematic Universe but Hawkeye. Now that the Devil of Hell's Kitchen is back, the questions turn to Daredevil's MCU future and whether or not he'll eventually the Avengers.
Of course, Daredevil ed the Avengers in Marvel Comics so there's precedent in the source material. In Netflix's Marvel canon, Daredevil was part of Daredevil will play in MCU Phase 4, especially if and when the Avengers assemble again.
As much of a fan-favorite as Daredevil is, he's not an ideal fit for the Avengers. Even more so than the "friendly neighborhood Spider-Man," Daredevil is a street-level superhero who prowls the dark corners of Hell's Kitchen. Meanwhile, the Avengers take on "Avengers-level threats" such as Thanos (Josh Brolin), hordes of alien invaders like the Chitauri and the Black Order, and the android armies of Ultron (James Spader). The Avengers counted non-powered heroes like Hawkeye (Jeremy Renner) and Black Widow (Scarlett Johansson) as but at least Clint Barton and Natasha Romanoff were highly-trained and technologically savvy Agents of SHIELD. By contrast, Matt Murdock is merely an excellent hand-to-hand combatant.
Matt Murdock does have superpowers but Daredevil's enhanced senses and weapon of choice - an expandable billy club - aren't what one would bring into a battle against the most powerful and deadly villains the MCU has to offer. For his part, Spider-Man is often considered a street-level hero but the amazing wall-crawler is packed with superpowers like super strength, incredible reflexes, the ability to stick to walls, and web-shooters. This lets Spidey more than hold his own against Avengers-level enemies. Until Spider-Man: No Way Home, Peter Parker also benefited from Stark Tech suits and weapons. In truth, Spider-Man is in a different league than Daredevil as a superhero. As the MCU's new flagship hero now that Iron Man (Robert Downey Jr.) is dead, Spidey's status as an Avenger makes sense.
This isn't to say Daredevil is useless by any means; he's a formidable, experienced, and dangerous superhero. But Matt Murdock would simply be outclassed by most of the menaces the Avengers face since he's not a Super-Soldier like Bucky Barnes (Sebastian Stan) and doesn't even have the high-tech wings and training of Captain America Sam Wilson (Anthony Mackie). Daredevil's best value would be as an attorney since most of the Avengers have various legal and financial issues they cope with when they're not saving the world. Ultimately,
Daredevil is at his best stalking his classic stomping grounds of Hell's Kitchen. Fighting the Kingpin, Elektra (Elodie Yung), Bullseye (Wilson Bethel), and the Hand is more Matt Murdock's speed, and he's been nearly killed by his enemies several times. While it would be novel to see the Devil of Hell's Kitchen rocketing into space to battle Kang (Jonathan Majors) or zipping through the Quantum Realm with the Avengers, Matt Murdock might be the first to realize it's really not where Daredevil belongs.