Bingo. Maybe if this was 3 years ago you (and to be fair, others around here) would be correct. What the market has borne out post COVID is that the guarantee of multiple billion dollar films in the same year is not a thing any more. It can happen mind you, but there is not unlimited goodwill and money out there, people are definitely weighing their options. A lot of films that would have been highly successful even a few years ago come in way below expectations no matter the quality or studio. And it isn't just that people don't want to go to theaters either because it is bleeding into streaming too for both films and television.
And as for this theory by some that Joker 2 will somehow doom or put the DCU behind an 8 ball...how much did Joker help those things when it made a billion? Zero, because it is a standalone film that has zero to do with anything except the studio name and the DC Brand. Hell The Batman and Penguin are successes (so far) and they aren't going to help all that much either. I think people assume that most people are divided over this stuff on the same level nerds like us are and in truth, most people see a cool trailer and go see the film. If it ties in to something great, if it doesn't they don't care. If it doesn't explicitly crossover no one holds the quality (positive or negative) against the other films made by said studio.