I don't recall ever seeing them do a deal like this at least in recent memory. Maybe they are testing to see if the locals have any interest. I think conceptually it's a good idea. Most people I know who no longer have passes primarily miss being able to go down there in the evening, so this seems to fill that void if you really wanted to go.
As with anything, your mileage may vary on if you think it's worth it or not. If the hours are midnight and 10 PM at each park, at least you're getting the maximum amount of evening hours possible. Not having some kind of discounted parking rate seems like an oversight, though.