Cuban has sold the Mavs to Adelson-Dumont Family

[StrandedOnBeauboisHill]

The area you are talking about is on the W side of the what will be the lake (the long-planned lake is currently just a river and river bottoms flood plain). That's farther away from downtown, less valuable. The W side doesn't contain the highway infrastructure to take a big number of people to your doorstep, whereas it is to a large degree already in place on the E side. 

Instead, I see their plan being to get first dibs on the land between I-35 and the lake, ie on the E side of the lake, that sits directly west of the AAC. It's generally where the practice facility has been sited. Currently that whole area is a warehouse district, with property owners holding tight to old warehouse buildings in anticipation of the day when the lake comes in and they get a massive payday as their land values explode. Every owner in that broad area has some speculative thoughts about the future payday and is looking ahead.

Just want to throw this back out there but I have already heard from some folks with family who work at HKS (folks who build Globe Life) that they have already been working with Cuban and designing something to go in the space "behind the practice facility" which aligns with your thoughts here.