I just wanted to say, that his commute to Dallas will very likely also be about 45 mins to an hour, depending on where you move. A majority of people who work in Dallas commute, and traffic is pretty bad. There are a lot of wonderful small cities to move to that are more family oriented with great school districts and more affordable, so people choose to commute for that reason.
I understand how you can feel frustrated with him always working. Will he have more regular hours at this new job? In the meantime, have you thought about moving the kids bedtime up to maybe 8:30 so they get an extra hour with dad? On the weekends, can he put a timer on his work... get out of the house for a few hours to spend quality time with each other?
Really, it comes down to his workload. If the new job is something how can handle at the office, and not come home and work on it all night and all weekend long, than that would be a huge blessing. Is he for sure that this Texas job will be more manageable?
Maybe, this move will be good for your family, I would really pray about it. It sounds like he is aware of the work being damaging to the family relationship and is willing to take the risk.
As for you two, strive for a date night once a week. Even if it means curling up on the couch for an hour watching a favorite show, snacking and talking for an hour. You both really need to start communicating with each other and opening up, otherwise this disconnect isn't going to go away. Families can survive these shifts, but you all need to be firm together.