Largely because Warner Brothers is a good movie studio buried in a terrible corporation. It’d be sad to see it go away.
WB going away or shrinking likely reduces Hollywoods movie output, consolidates the industry, makes it less competitive and reduces opportunity for talent.
In a different world WB the studio is a successful standalone company not burdened with debt due to Zaslovs idiotic bets.
(And Ellisons overpaying for it is probably the most serious buyer. It’s the only reason it’s a topic. I’m skeptical of other transactions)