I doubt they would lose the brand. DC is one of WB’s crown jewels and gives them a big leg up in the entertainment and consumer products industries. Whether movies perform well or not, there’s more to the health of a brand than that (but make no mistake, movies are a big priority). If they lost DC, what would WB bank on as far as well known brands? Harry Potter and Looney Tunes most likely. Harry Potter is a big deal but I highly doubt Looney Tunes outperforms DC. Merchandising is where the real money is and while Harry Potter is a big deal there, DC is decades ahead of it as DC merchandise of some kind has always been available for decades and decades now.
All of that aside…I guess…Universal would be my pick. They can handle big brands (Jurassic Park, Fast and the Furious, etc) pretty well. Paramount? No. They’re doing well with Mission: Impossible though. Star Trek? They did great with it in the past but the fate of the movies is unknown right now (TV is a different story). Fox? Nah. Disney? No thanks, absolutely not.