Go ask the Hollywood press doomsaying Disney's future if they're "crazy".
They are trying to sell papers. Disney has some deep challenges to be sure, but its not as if movies and theme parks will cease to exist in the new world order.
The Knotts Berry portion that is open is the equivalent to Downtown Disney on a much smaller scale. I don't even think it requires employees at a turnstile.
And Downtown is also currently operating at a phased opening.
Knott's is selling tickets for their event so I would imagine they have someone running a turnstile (I haven't been myself).
Downtown Disney has been hitting the capacity restriction they implemented, off and on, and they've been looking at ways to increase capacity (using empty buildings for temp merch space).
The two biggest drawbacks for Disney opening for a food event ala Knott's, is cost and value. The cost of the labor for Disney to do anything is far beyond what most normal businesses would have to spend. Knott's can get away with it, because their have a barebone workforce that is being paid close to minimum wage. A couple hundred people could probably run the park. At Disney, operating food booths would require additional ticket takers, security, parking, distribution, runners, chefs, line cooks, food prep, cashiers... it's a lot of people being paid a decent union wage. So the amount they would have to charge, to cover their labor costs, while working within the capacity limitations, would probably not make for a viable product the market would see valuable.
That really only covers the first item cost. I think that Disney still sees immense value in the ability to enter their parks, and selling a chance to enter Disneyland and walk down Main Street for $40 or $50 isn't in line with what they think that experience is worth. They wouldn't want to undervalue the chance to enter the park, when they know they will need to sell full day admission tickets and annual passes once they have the approval to do so. Opening now at a severe discount, would hurt future sales.
But the point of this is to show that, both of those are decisions that Disney would weigh and determine on their own. Not something being implemented by the state government. It might not make economic sense to open in a similar fashion as Knott's, but they are not restricted in doing so.