They’ll keep it as “loose canon”
Basically if Cox shows up as daredevil then you can assume daredevil is canon, same with bernthal as punisher.
However. Anything in their shows that may contradict future shit they make is not canon. Like if they re-do the secret mystical city of kun lun for the shang chi movie.
Fortunately most of their stories were pretty much entirely self contained. And daredevil was all around great so I don’t see them recasting kingpin or bullseye if they ever bring them back
Luke cage and iron fist are probably getting retconned ASAP
Jessica Jones is a maybe. It’s not like she’d ever show up again anyway. It’d be pretty out of character for her to show up to a big event in a movie
Maybe they’ll retcon nuke from her show out for a future storyline with captain America though