Since it is currently my job to see them (in effect), I'll keep doing that as long as they are released in cinemas. But yes, I think the MCU should have ended with Endgame (give or take the Spider-Man films with Tom Holland). Star Wars is another series that should have ended ages ago (probably with Return of the Jedi, but The Last Jedi is the strongest post-original trilogy film in terms of justifying its existence in artistic terms).