Again, like I said, all privately funded.
I also would make sure these are located in a manner which would minimize impact to existing local businesses. Sending our tax dollars across the state line, still just doesn't make sense.
Texas has close to 30 million people. LA has around 4.5 and Oklahoma has around 3.
For LA and OK to make money, they would need to attract a certain number of out-of state visitors. This can be done without too much difficulty at present.
Who would Texas attract? Even if everyone from LA and OK were to come to TX, it wouldn’t even register. This means that the gambling would be TX locals. Where would you locate your casinos? Houston, Dallas, Ft. Worth, Austin, San Antonio.
Remember that TX doesn’t have an income tax, only a sales tax. So TX only makes money off residents when they spend money in TX. If they are spending their money gambling, then they aren’t spending money on other things, which would lead to a decrease in state revenues.
You are right that TX spending money in OK and LA is a missed revenue stream, but the question is whether it is beneficial to the state of TX to do anything about it. I don’t think there would be any benefit to TX to try to compete with LA and OK by opening up gambling casinos in the population centres.