It's gonna be a LOT cheaper to make those modifications at the restaurant than in any of the public spaces in the arena building. Based on what I heard the other night, if it's structural (and this would be), it ain't happening. Keep in mind, construction costs have gone up 30 to 40-ish percent since the initial budgets were done. At the restaurant all they have to do is add the vault, do some partition work and upgrade the security features ... in a ground level one story building ... which is easy peasy as these things go.
I'm thinking you MIGHT eventually see the sports book moved to a new restaurant/bar building in the entertainment district. Especially if they can get somebody else to pay for it, like the vendor. Until then, Backyard Bistro is fine.