A properly functioning live action DCEU is what they need now. They've been stuck in place for the most part since Justice League failed four years ago. Side projects like this don't interest me.
Disney did do a great animated adaption of Big Hero 6, but that was when the MCU was running hot and dominating the movies, and it was a fun side project.
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"I'm not smart so much as I am not dumb." - Harlan Ellison