Thats what they did in Florida, if you look back to how backwoods rural that part of florida was check out some of the backlash of disneyworld being built. Theres a really good 60 minutes about it, and the locals werent happy with the traffic about to come.
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oh and heres a park you prob didnt even know existed in dallas (for a few years) supposedly theres still a part remaining.
You've put a lot of thought into this! Hmmm... looking at your map, I would vote for the Bryan/College Station or Brenham area. A&M is in College Station. Blue Bell is in Brenham. In Houston, we used to have Astroworld and I know all the people who grew up going there miss it. Houstonians might be willing to travel to Brenham since it's only about 45 minutes away. But I still say we don't have good enough weather to justify it. Would you quit going to Disney World if they built one in Texas? I wouldn't.