The theater chains need it. Very, very badly. And, as of right now, basically every move that a traditional studio has made to try to get a foothold in the streaming game has backfired (at least as it pertains to movies). So everyone needs theaters to stay alive to have any hope of theatrical surviving.

So yeah, it's less that "Barbie and Oppenheimer mean we'll get a 2+ billion pair of movies every summer", and more that "we'll actually have another summer thanks to Barbie and Oppenheimer."