08
Aug
Here's a more concrete way of acknowledging that: WBD just took a $9 billion accounting hit because it has concluded that its aging TV assets aren't worth nearly as much as it thought — perhaps because they won't have NBA games to show after the next season. For context, WBD's entire market cap is around $18 billion.Investors reacted to the news by pushing the company's stock down by more than 8%.OK. So what's next?If you or I buy something and it turns out we overestimated its value by a lot, bad things can happen.But the thing about giant writedowns in…