I actually think a crossover like this would do wonders for both publishers and comic shops alike if marketed well. At a time like this, the comic community needs to stick together wherever possible to survive. Is it really that crazy to think Disney and Warner Bros would work together to help everyone get through this?
Could you imagine a list of creators like we saw on Marvel Comics #1000 pitting the greatest heroes from both companies together against some insurmountable force? Sign me up.