Millions per acre is high, unless they wanted to build within a city like the plans @lazyboy97o shared above (thanks for sharing - that was cool!).It’s crazy that the Dallas metro area has grown from 3 million people to 6.5 million in 30 years.
Current predictions have Texas passing California as the most populous state around 2045, if I were Disney I’d try to capitalize on that growth, they may have already missed their chance though, the cheap land they could have bought back in 1989 is likely millions an acre now.
They could do what they did in Florida and attempt to stealth purchase cheaper land in the boonies - there is a cottage industry here of companies acquiring drilling leases surreptitiously. The problem building in a rural area is the need for infrastructure. But building near Houston would have the advantage of two major airports plus access to Galveston for DCL sailings.
Interesting to ponder, though it does seem extraordinarily unlikely.