They especially need to adapt away from the 90-day minimum window most major theaters try to still hang onto. The fact of the matter is that films make the vast majority of their money in the first 14 days of release. There's no reason for movies to be required to keep a movie in theaters for so long when they make most of the money upfront.
I fear it's gonna take Disney threatening to take something like, a Star Wars, Pixar or Marvel movie straight to Disney+ if they won't agree to change their business model. Or WB threatening to take a big DC move straight to HBO MAX. Or Universal saying they're taking Jurassic World and Fast 9 to streaming.
Interesting times, we're in. So much is happening in the streaming realm and theaters can't just sit around and not adapt.