I agree on your point about having to divert to San Antonio (and then deal with its traffic) to get to Dallas. People going west out of Houston have exactly the same problem with San Antonio.
The solution: Build some cheap bypass sections to get around San Antonio (and Austin, as necessary). Five cents more of gas tax would easily cover both (but not too many other additional projects).
In other words, don't just trash and sellout the entire Interstate system in the State of Texas.
In other words, don't just trash and sellout the entire Interstate system in the State of Texas. The new corridors won't do that. They will interconnect with the existing Interstate system, but they will also add rights of way for rail, high speed transport, pipelines, telecommunications, water, electricity, etc. in addition to four lanes of truck traffic and six lanes of auto traffic.