Id prefer just about anyone but Barron Collier to own that land, they're one of the biggest land bankers out there.
Im not sure I like Johnsons idea of just expanding the park. The park is already under utilized as is. As weird as it may sound, Central Phoenix might have too much park space, at least relative to the low population density we currently have. A lot of people just play catch or whatever in their yard instead of going to a park.
As for what Id like to happen to the land, I posted
this idea on MyPlanPhx a while back. We lack higher education options here and it makes a certain amount of sense to bring back an 'Indian School' of sorts. There's Haskell in Kansas, but its tiny and Lawrence, KS appeals to much different people than Phoenix, AZ would.
E: Also regarding a casino there: I don't see that happening. I like Justin Johnson from my interactions with him, but dont know where he's coming from on this one. The thing in Glendale was a very unusual circumstance and thats actual Reservation land. The land at Central/ISR wouldn't suddenly become a Reservation because the Feds own it. The Indian Gaming Pact is pretty strict, I dont think a Casino is something to worry about/hope for (depending on your perspective).
Considering the amount of money Barron Colliers has put into that parcel, you know they won't build anything there unless its a huge project so they can recoup their costs. Unfortunately, I dont see any huge office tower projects or anything happening there any time soon, so its probably best to get it out of their hands.