Ok, so Disney has about $10B in cash and another $10B in available credit, roughly $20B in available monies.
The floor for Hulu is valued at $9B. Assuming they don't lose any more money and assuming The Marvels turns out not to be a success on the level of Barbie, they'll likely go into 2024 with $20B on hand.
$20B - $9B = $11B. Fine.
Now, imagine if Hulu's valuation is actually greater than $9B or even worse, rises between November and January. How would that happen? What if there's an organized effort to get a bunch of people to sign up at the end of the year, similar to an AMC or GME short squeeze?
They could drive the cost up to $50B, but Disney only has $20B. They would go bankrupt. And unless they sold, it would ki-l Disney. Effectively leaving Comcast/Universal as the top dog.