I have watched all episodes of Agents of Shield, Daredevil, Jessica Jones, Luke Cage, Punisher, Iron Fist, Defenders, Inhumans, Legixn, The Gifted, Runaways, Cloak & Dagger and Helstro. None of them got as hype as the latest Marvel movie and they literally just ended without a big anticipation from the masses.
The only reason WandaVision and the other upcoming Marvel streaming shows might get more attention than Black Widow, Shang-Chi and Eternals as of the moment is we are in a pandemic, either theaters are closed or people aren't just going to the cinemas because of covid. But i seriously doubt a 2hr Black Widow film (if released straight through Disney+) is going to get more views/clicks than a weekly tv series. And just because its Fiege and Marvel Studios are producing these streaming shows, it doesn't mean itsgoing to attract the people that didn't watch the previous shows.
And as for mcu film actors, people could just choose to wait for their film appearance rather commit to a weekly tv series.